constants.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<appendix xml:id="intl.constants" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 &reftitle.constants;
 <para>
  <variablelist>
   <varlistentry xml:id="constant.intl-icu-data-version">
    <term>
     <constant>INTL_ICU_DATA_VERSION</constant>
     (<type>string</type>)
    </term>
    <listitem>
     <simpara>
      Data version in ICU4C.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.intl-icu-version">
    <term>
     <constant>INTL_ICU_VERSION</constant>
     (<type>string</type>)
    </term>
    <listitem>
     <simpara>
      The current ICU library version as a dotted-decimal string.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.intl-max-locale-len">
    <term>
     <constant>INTL_MAX_LOCALE_LEN</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Limit on locale length, set to 80 in PHP code. Locale names longer
      than this limit will not be accepted.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-default">
    <term>
     <constant>IDNA_DEFAULT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Prohibit processing of unassigned codepoints in the input for IDN
      functions and do not check if the input conforms to domain name ASCII rules.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-allow-unassigned">
    <term>
     <constant>IDNA_ALLOW_UNASSIGNED</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Allow processing of unassigned codepoints in the input for IDN functions.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-use-std3-rules">
    <term>
     <constant>IDNA_USE_STD3_RULES</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Check if the input for IDN functions conforms to domain name ASCII rules.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-check-bidi">
    <term>
     <constant>IDNA_CHECK_BIDI</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Check whether the input conforms to the BiDi rules.
      Ignored by the IDNA2003 implementation, which always performs this check.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-check-contextj">
    <term>
     <constant>IDNA_CHECK_CONTEXTJ</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Check whether the input conforms to the CONTEXTJ rules.
      Ignored by the IDNA2003 implementation, as this check is new in IDNA2008.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-nontransitional-to-ascii">
    <term>
     <constant>IDNA_NONTRANSITIONAL_TO_ASCII</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Option for nontransitional processing in
      <function>idn_to_ascii</function>. Transitional processing is activated
      by default. This option is ignored by the IDNA2003 implementation.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-nontransitional-to-unicode">
    <term>
     <constant>IDNA_NONTRANSITIONAL_TO_UNICODE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Option for nontransitional processing in
      <function>idn_to_utf8</function>. Transitional processing is activated
      by default. This option is ignored by the IDNA2003 implementation.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.intl-idna-variant-2003">
    <term>
     <constant>INTL_IDNA_VARIANT_2003</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Use IDNA 2003 algorithm in <function>idn_to_utf8</function> and
      <function>idn_to_ascii</function>. This is the default.
      This constant and using the default has been deprecated as of PHP 7.2.0.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.intl-idna-variant-uts46">
    <term>
     <constant>INTL_IDNA_VARIANT_UTS46</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Use UTS #46 algorithm in <function>idn_to_utf8</function> and
      <function>idn_to_ascii</function>.
      Available as of ICU 4.6.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.grapheme-extr-count">
    <term>
     <constant>GRAPHEME_EXTR_COUNT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      The number of default grapheme clusters to extract.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.grapheme-extr-maxbytes">
    <term>
     <constant>GRAPHEME_EXTR_MAXBYTES</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      The maximum number of bytes returned.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.grapheme-extr-maxchars">
    <term>
     <constant>GRAPHEME_EXTR_MAXCHARS</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      The maximum number of UTF-8 characters returned.
     </simpara>
    </listitem>
   </varlistentry>
  </variablelist>
  <variablelist xml:id="constant.idna-errors">
   <para>
    The following errors are part of a bitmask returned by the UTS #46 algorithm in
    <function>idn_to_utf8</function> and <function>idn_to_ascii</function>.
   </para>
   <varlistentry xml:id="constant.idna-error-empty-label">
    <term>
     <constant>IDNA_ERROR_EMPTY_LABEL</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-error-label-too-long">
    <term>
     <constant>IDNA_ERROR_LABEL_TOO_LONG</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-error-domain-name-too-long">
    <term>
     <constant>IDNA_ERROR_DOMAIN_NAME_TOO_LONG</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-error-leading-hyphen">
    <term>
     <constant>IDNA_ERROR_LEADING_HYPHEN</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-error-trailing-hyphen">
    <term>
     <constant>IDNA_ERROR_TRAILING_HYPHEN</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-error-hyphen-3-4">
    <term>
     <constant>IDNA_ERROR_HYPHEN_3_4</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-error-leading-combining-mark">
    <term>
     <constant>IDNA_ERROR_LEADING_COMBINING_MARK</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-error-disallowed">
    <term>
     <constant>IDNA_ERROR_DISALLOWED</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-error-punycode">
    <term>
     <constant>IDNA_ERROR_PUNYCODE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-error-label-has-dot">
    <term>
     <constant>IDNA_ERROR_LABEL_HAS_DOT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-error-invalid-ace-label">
    <term>
     <constant>IDNA_ERROR_INVALID_ACE_LABEL</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-error-bidi">
    <term>
     <constant>IDNA_ERROR_BIDI</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.idna-error-contextj">
    <term>
     <constant>IDNA_ERROR_CONTEXTJ</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.uloc-actual-locale">
    <term>
     <constant>ULOC_ACTUAL_LOCALE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      The locale the data actually comes from.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.uloc-valid-locale">
    <term>
     <constant>ULOC_VALID_LOCALE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      The most specific locale supported by ICU.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-ambiguous-alias-warning">
    <term>
     <constant>U_AMBIGUOUS_ALIAS_WARNING</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      This converter alias can go to different converter implementations.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-bad-variable-definition">
    <term>
     <constant>U_BAD_VARIABLE_DEFINITION</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Missing <literal>'$'</literal> or duplicate variable name.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-assign-error">
    <term>
     <constant>U_BRK_ASSIGN_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Syntax error in RBBI rule assignment statement.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-error-limit">
    <term>
     <constant>U_BRK_ERROR_LIMIT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      This must always be the last value to indicate the limit for Break Iterator failures.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-error-start">
    <term>
     <constant>U_BRK_ERROR_START</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Start of codes indicating Break Iterator failures.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-hex-digits-expected">
    <term>
     <constant>U_BRK_HEX_DIGITS_EXPECTED</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Hex digits expected as part of a escaped char in a rule.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-init-error">
    <term>
     <constant>U_BRK_INIT_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Initialization failure. Probable missing ICU Data.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-internal-error">
    <term>
     <constant>U_BRK_INTERNAL_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      An internal error (bug) was detected.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-malformed-rule-tag">
    <term>
     <constant>U_BRK_MALFORMED_RULE_TAG</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      The <literal>{nnn}</literal> tag on a rule is mal formed.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-mismatched-paren">
    <term>
     <constant>U_BRK_MISMATCHED_PAREN</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Mis-matched parentheses in an RBBI rule.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-new-line-in-quoted-string">
    <term>
     <constant>U_BRK_NEW_LINE_IN_QUOTED_STRING</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Missing closing quote in an RBBI rule.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-rule-empty-set">
    <term>
     <constant>U_BRK_RULE_EMPTY_SET</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Rule contains an empty Unicode Set.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-rule-syntax">
    <term>
     <constant>U_BRK_RULE_SYNTAX</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Syntax error in RBBI rule.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-semicolon-expected">
    <term>
     <constant>U_BRK_SEMICOLON_EXPECTED</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Missing <literal>';'</literal> at the end of a RBBI rule.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-unclosed-set">
    <term>
     <constant>U_BRK_UNCLOSED_SET</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      UnicodeSet writing an RBBI rule missing a closing <literal>']'</literal>.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-undefined-variable">
    <term>
     <constant>U_BRK_UNDEFINED_VARIABLE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Use of an undefined <code>$Variable</code> in an RBBI rule.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-unrecognized-option">
    <term>
     <constant>U_BRK_UNRECOGNIZED_OPTION</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Option in RBBI rules not recognized.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-brk-variable-redfinition">
    <term>
     <constant>U_BRK_VARIABLE_REDFINITION</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      RBBI rule variable redefined.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-buffer-overflow-error">
    <term>
     <constant>U_BUFFER_OVERFLOW_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A result would not fit in the supplied buffer.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-ce-not-found-error">
    <term>
     <constant>U_CE_NOT_FOUND_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Currently used only while setting variable top, but can be used generally.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-collator-version-mismatch">
    <term>
     <constant>U_COLLATOR_VERSION_MISMATCH</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Collator version is not compatible with the base version.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-different-uca-version">
    <term>
     <constant>U_DIFFERENT_UCA_VERSION</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      ucol_open encountered a mismatch between UCA version and collator image version,
      so the collator was constructed from rules. No impact to further function.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-enum-out-of-sync-error">
    <term>
     <constant>U_ENUM_OUT_OF_SYNC_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      <code>UEnumeration</code> out of sync with underlying collection.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-error-limit">
    <term>
     <constant>U_ERROR_LIMIT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Alias of <constant>U_PLUGIN_ERROR_LIMIT</constant>.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-error-warning-limit">
    <term>
     <constant>U_ERROR_WARNING_LIMIT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      This must always be the last warning value to indicate
      the limit for UErrorCode warnings (last warning code +1).
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-error-warning-start">
    <term>
     <constant>U_ERROR_WARNING_START</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Start of information results (semantically successful).
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-file-access-error">
    <term>
     <constant>U_FILE_ACCESS_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      The requested file cannot be found.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-fmt-parse-error-limit">
    <term>
     <constant>U_FMT_PARSE_ERROR_LIMIT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      The limit for format library errors.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-fmt-parse-error-start">
    <term>
     <constant>U_FMT_PARSE_ERROR_START</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Start of format library errors.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-idna-ace-prefix-error">
    <term>
     <constant>U_IDNA_ACE_PREFIX_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>

     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-idna-check-bidi-error">
    <term>
     <constant>U_IDNA_CHECK_BIDI_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>

     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-idna-domain-name-too-long-error">
    <term>
     <constant>U_IDNA_DOMAIN_NAME_TOO_LONG_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>

     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-idna-error-limit">
    <term>
     <constant>U_IDNA_ERROR_LIMIT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>

     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-idna-error-start">
    <term>
     <constant>U_IDNA_ERROR_START</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>

     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-idna-label-too-long-error">
    <term>
     <constant>U_IDNA_LABEL_TOO_LONG_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>

     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-idna-prohibited-error">
    <term>
     <constant>U_IDNA_PROHIBITED_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>

     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-idna-std3-ascii-rules-error">
    <term>
     <constant>U_IDNA_STD3_ASCII_RULES_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>

     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-idna-unassigned-error">
    <term>
     <constant>U_IDNA_UNASSIGNED_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>

     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-idna-verification-error">
    <term>
     <constant>U_IDNA_VERIFICATION_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>

     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-idna-zero-length-label-error">
    <term>
     <constant>U_IDNA_ZERO_LENGTH_LABEL_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>

     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-illegal-argument-error">
    <term>
     <constant>U_ILLEGAL_ARGUMENT_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Indicates an incorrect argument value.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-illegal-char-found">
    <term>
     <constant>U_ILLEGAL_CHAR_FOUND</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Character conversion: Illegal input sequence.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-illegal-char-in-segment">
    <term>
     <constant>U_ILLEGAL_CHAR_IN_SEGMENT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Unused as of ICU 2.4.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-illegal-character">
    <term>
     <constant>U_ILLEGAL_CHARACTER</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A special character is outside its allowed context.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-illegal-escape-sequence">
    <term>
     <constant>U_ILLEGAL_ESCAPE_SEQUENCE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      ISO-2022 illlegal escape sequence.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-illegal-pad-position">
    <term>
     <constant>U_ILLEGAL_PAD_POSITION</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Pad symbol misplaced in number pattern.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-index-outofbounds-error">
    <term>
     <constant>U_INDEX_OUTOFBOUNDS_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Trying to access the index that is out of bounds.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-internal-program-error">
    <term>
     <constant>U_INTERNAL_PROGRAM_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Indicates a bug in the library code.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-internal-transliterator-error">
    <term>
     <constant>U_INTERNAL_TRANSLITERATOR_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Internal transliterator system error.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-invalid-char-found">
    <term>
     <constant>U_INVALID_CHAR_FOUND</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Character conversion: Unmappable input sequence. In other APIs: Invalid character.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-invalid-format-error">
    <term>
     <constant>U_INVALID_FORMAT_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Data format is not what is expected.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-invalid-function">
    <term>
     <constant>U_INVALID_FUNCTION</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A <literal>'&amp;fn()'</literal> rule specifies an unknown transliterator.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-invalid-id">
    <term>
     <constant>U_INVALID_ID</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A <literal>'::id'</literal> rule specifies an unknown transliterator.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-invalid-property-pattern">
    <term>
     <constant>U_INVALID_PROPERTY_PATTERN</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Unused as of ICU 2.4.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-invalid-rbt-syntax">
    <term>
     <constant>U_INVALID_RBT_SYNTAX</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A <literal>'::id'</literal> rule was passed to the RuleBasedTransliterator parser.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-invalid-state-error">
    <term>
     <constant>U_INVALID_STATE_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Requested operation can not be completed with ICU in its current state.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-invalid-table-file">
    <term>
     <constant>U_INVALID_TABLE_FILE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Conversion table file not found.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-invalid-table-format">
    <term>
     <constant>U_INVALID_TABLE_FORMAT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Conversion table file found, but corrupted.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-invariant-conversion-error">
    <term>
     <constant>U_INVARIANT_CONVERSION_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Unable to convert a <code>UChar*</code> string to <code>char*</code>
      with the invariant converter.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-malformed-exponential-pattern">
    <term>
     <constant>U_MALFORMED_EXPONENTIAL_PATTERN</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Grouping symbol in exponent pattern.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-malformed-pragma">
    <term>
     <constant>U_MALFORMED_PRAGMA</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A <literal>'use'</literal> pragma is invalid.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-malformed-rule">
    <term>
     <constant>U_MALFORMED_RULE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Elements of a rule are misplaced.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-malformed-set">
    <term>
     <constant>U_MALFORMED_SET</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A <code>UnicodeSet</code> pattern is invalid.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-malformed-symbol-reference">
    <term>
     <constant>U_MALFORMED_SYMBOL_REFERENCE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Unused as of ICU 2.4.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-malformed-unicode-escape">
    <term>
     <constant>U_MALFORMED_UNICODE_ESCAPE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A Unicode escape pattern is invalid.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-malformed-variable-definition">
    <term>
     <constant>U_MALFORMED_VARIABLE_DEFINITION</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A variable definition is invalid.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-malformed-variable-reference">
    <term>
     <constant>U_MALFORMED_VARIABLE_REFERENCE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A variable reference is invalid.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-memory-allocation-error">
    <term>
     <constant>U_MEMORY_ALLOCATION_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Memory allocation error.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-message-parse-error">
    <term>
     <constant>U_MESSAGE_PARSE_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Unable to parse a message (message format).
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-mismatched-segment-delimiters">
    <term>
     <constant>U_MISMATCHED_SEGMENT_DELIMITERS</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Unused as of ICU 2.4.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-misplaced-anchor-start">
    <term>
     <constant>U_MISPLACED_ANCHOR_START</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A start anchor appears at an illegal position.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-misplaced-compound-filter">
    <term>
     <constant>U_MISPLACED_COMPOUND_FILTER</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A compound filter is in an invalid location.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-misplaced-cursor-offset">
    <term>
     <constant>U_MISPLACED_CURSOR_OFFSET</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A cursor offset occurs at an illegal position.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-misplaced-quantifier">
    <term>
     <constant>U_MISPLACED_QUANTIFIER</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A quantifier appears after a segment close delimiter.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-missing-operator">
    <term>
     <constant>U_MISSING_OPERATOR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A rule contains no operator.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-missing-resource-error">
    <term>
     <constant>U_MISSING_RESOURCE_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      The requested resource cannot be found.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-missing-segment-close">
    <term>
     <constant>U_MISSING_SEGMENT_CLOSE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Unused as of ICU 2.4.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-multiple-ante-contexts">
    <term>
     <constant>U_MULTIPLE_ANTE_CONTEXTS</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      More than one ante context.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-multiple-compound-filters">
    <term>
     <constant>U_MULTIPLE_COMPOUND_FILTERS</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      More than one compound filter.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-multiple-cursors">
    <term>
     <constant>U_MULTIPLE_CURSORS</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      More than one cursor.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-multiple-decimal-separators">
    <term>
     <constant>U_MULTIPLE_DECIMAL_SEPARATORS</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      More than one decimal separator in number pattern.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-multiple-decimal-seperators">
    <term>
     <constant>U_MULTIPLE_DECIMAL_SEPERATORS</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Alias of <constant>U_MULTIPLE_DECIMAL_SEPARATORS</constant>.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-multiple-exponential-symbols">
    <term>
     <constant>U_MULTIPLE_EXPONENTIAL_SYMBOLS</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      More than one exponent symbol in number pattern.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-multiple-pad-specifiers">
    <term>
     <constant>U_MULTIPLE_PAD_SPECIFIERS</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      More than one pad symbol in number pattern.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-multiple-percent-symbols">
    <term>
     <constant>U_MULTIPLE_PERCENT_SYMBOLS</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      More than one percent symbol in number pattern.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-multiple-permill-symbols">
    <term>
     <constant>U_MULTIPLE_PERMILL_SYMBOLS</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      More than one permill symbol in number pattern.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-multiple-post-contexts">
    <term>
     <constant>U_MULTIPLE_POST_CONTEXTS</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      More than one post context.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-no-space-available">
    <term>
     <constant>U_NO_SPACE_AVAILABLE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      No space available for in-buffer expansion for Arabic shaping.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-no-write-permission">
    <term>
     <constant>U_NO_WRITE_PERMISSION</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Attempt to modify read-only or constant data.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-parse-error">
    <term>
     <constant>U_PARSE_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Equivalent to Java <code>ParseException</code>.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-parse-error-limit">
    <term>
     <constant>U_PARSE_ERROR_LIMIT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      The limit for Transliterator errors.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-parse-error-start">
    <term>
     <constant>U_PARSE_ERROR_START</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Start of Transliterator errors.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-pattern-syntax-error">
    <term>
     <constant>U_PATTERN_SYNTAX_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Syntax error in format pattern.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-primary-too-long-error">
    <term>
     <constant>U_PRIMARY_TOO_LONG_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      User tried to set variable top to a primary that is longer than two bytes.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-bad-escape-sequence">
    <term>
     <constant>U_REGEX_BAD_ESCAPE_SEQUENCE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Unrecognized backslash escape sequence in pattern.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-bad-interval">
    <term>
     <constant>U_REGEX_BAD_INTERVAL</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Error in <literal>{min,max}</literal> interval.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-error-limit">
    <term>
     <constant>U_REGEX_ERROR_LIMIT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      This must always be the last value to indicate the limit for regexp errors.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-error-start">
    <term>
     <constant>U_REGEX_ERROR_START</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Start of codes indicating Regexp failures.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-internal-error">
    <term>
     <constant>U_REGEX_INTERNAL_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      An internal error (bug) was detected.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-invalid-back-ref">
    <term>
     <constant>U_REGEX_INVALID_BACK_REF</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Back-reference to a non-existent capture group.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-invalid-flag">
    <term>
     <constant>U_REGEX_INVALID_FLAG</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Invalid value for match mode flags.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-invalid-state">
    <term>
     <constant>U_REGEX_INVALID_STATE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      <code>RegexMatcher</code> in invalid state for requested operation.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-look-behind-limit">
    <term>
     <constant>U_REGEX_LOOK_BEHIND_LIMIT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Look-Behind pattern matches must have a bounded maximum length.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-max-lt-min">
    <term>
     <constant>U_REGEX_MAX_LT_MIN</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      In <literal>{min,max}</literal>, max is less than min.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-mismatched-paren">
    <term>
     <constant>U_REGEX_MISMATCHED_PAREN</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Incorrectly nested parentheses in regexp pattern.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-number-too-big">
    <term>
     <constant>U_REGEX_NUMBER_TOO_BIG</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Decimal number is too large.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-property-syntax">
    <term>
     <constant>U_REGEX_PROPERTY_SYNTAX</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Incorrect Unicode property.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-rule-syntax">
    <term>
     <constant>U_REGEX_RULE_SYNTAX</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Syntax error in regexp pattern.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-set-contains-string">
    <term>
     <constant>U_REGEX_SET_CONTAINS_STRING</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Regexps cannot have <code>UnicodeSet</code>s containing strings.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-regex-unimplemented">
    <term>
     <constant>U_REGEX_UNIMPLEMENTED</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Use of regexp feature that is not yet implemented.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-resource-type-mismatch">
    <term>
     <constant>U_RESOURCE_TYPE_MISMATCH</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      An operation is requested over a resource that does not support it.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-rule-mask-error">
    <term>
     <constant>U_RULE_MASK_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A rule is hidden by an earlier more general rule.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-safeclone-allocated-warning">
    <term>
     <constant>U_SAFECLONE_ALLOCATED_WARNING</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A <code>SafeClone</code> operation required allocating memory (informational only).
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-sort-key-too-short-warning">
    <term>
     <constant>U_SORT_KEY_TOO_SHORT_WARNING</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Number of levels requested in <code>getBound</code> is higher
      than the number of levels in the sort key.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-standard-error-limit">
    <term>
     <constant>U_STANDARD_ERROR_LIMIT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      This must always be the last value to indicate the limit for standard errors.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-state-old-warning">
    <term>
     <constant>U_STATE_OLD_WARNING</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      ICU has to use compatibility layer to construct the service.
      Expect performance/memory usage degradation.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-state-too-old-error">
    <term>
     <constant>U_STATE_TOO_OLD_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      ICU cannot construct a service from this state, as it is no longer supported.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-string-not-terminated-warning">
    <term>
     <constant>U_STRING_NOT_TERMINATED_WARNING</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      An output string could not be NUL-terminated because output <code>length==destCapacity</code>.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-stringprep-check-bidi-error">
    <term>
     <constant>U_STRINGPREP_CHECK_BIDI_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Alias of <constant>U_IDNA_CHECK_BIDI_ERROR</constant>.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-stringprep-prohibited-error">
    <term>
     <constant>U_STRINGPREP_PROHIBITED_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Alias of <constant>U_IDNA_PROHIBITED_ERROR</constant>.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-stringprep-unassigned-error">
    <term>
     <constant>U_STRINGPREP_UNASSIGNED_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Alias of <constant>U_IDNA_UNASSIGNED_ERROR</constant>.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-too-many-aliases-error">
    <term>
     <constant>U_TOO_MANY_ALIASES_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      There are too many aliases in the path to the requested resource.
      It is very possible that a circular alias definition has occured.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-trailing-backslash">
    <term>
     <constant>U_TRAILING_BACKSLASH</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A dangling backslash.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-truncated-char-found">
    <term>
     <constant>U_TRUNCATED_CHAR_FOUND</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Character conversion: Incomplete input sequence.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-unclosed-segment">
    <term>
     <constant>U_UNCLOSED_SEGMENT</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A closing <literal>')'</literal> is missing.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-undefined-segment-reference">
    <term>
     <constant>U_UNDEFINED_SEGMENT_REFERENCE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A segment reference does not correspond to a defined segment.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-undefined-variable">
    <term>
     <constant>U_UNDEFINED_VARIABLE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A variable reference does not correspond to a defined variable.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-unexpected-token">
    <term>
     <constant>U_UNEXPECTED_TOKEN</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Syntax error in format pattern.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-unmatched-braces">
    <term>
     <constant>U_UNMATCHED_BRACES</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Braces do not match in message pattern.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-unquoted-special">
    <term>
     <constant>U_UNQUOTED_SPECIAL</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A special character was not quoted or escaped.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-unsupported-attribute">
    <term>
     <constant>U_UNSUPPORTED_ATTRIBUTE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Unused as of ICU 2.4.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-unsupported-error">
    <term>
     <constant>U_UNSUPPORTED_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Requested operation not supported in current context.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-unsupported-escape-sequence">
    <term>
     <constant>U_UNSUPPORTED_ESCAPE_SEQUENCE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      ISO-2022 unsupported escape sequence.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-unsupported-property">
    <term>
     <constant>U_UNSUPPORTED_PROPERTY</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Unused as of ICU 2.4.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-unterminated-quote">
    <term>
     <constant>U_UNTERMINATED_QUOTE</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A closing single quote is missing.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-useless-collator-error">
    <term>
     <constant>U_USELESS_COLLATOR_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Collator is options only and no base is specified.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-using-default-warning">
    <term>
     <constant>U_USING_DEFAULT_WARNING</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A resource bundle lookup returned a result from the root locale (not an error).
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-using-fallback-warning">
    <term>
     <constant>U_USING_FALLBACK_WARNING</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      A resource bundle lookup returned a fallback result (not an error).
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-variable-range-exhausted">
    <term>
     <constant>U_VARIABLE_RANGE_EXHAUSTED</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      Too many stand-ins generated for the given variable range.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-variable-range-overlap">
    <term>
     <constant>U_VARIABLE_RANGE_OVERLAP</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      The variable range overlaps characters used in rules.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.u-zero-error">
    <term>
     <constant>U_ZERO_ERROR</constant>
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      No error, no warning.
     </simpara>
    </listitem>
   </varlistentry>
  </variablelist>
 </para>
</appendix>
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