Capability: Add a marker or multiple markers to a map

[NickFitz]

This issue is for discussion of the required API capability “Add a marker or multiple markers to a map”.

[prushforth]

Adding (and displaying) markers is by far the most common need, but it is specialization of a more general capability, which is to allow the user to input (any) simple features geometry. Multiple markers might be a "multipoint" type geometry, or it might be multiple points. This capability also leads into a discussion of how <form> elements might work in a map browsing context. We have had that discussion on and off in the MapML world e.g. <input type=location subtype=polygon> , but we need to actually implement something that experiments with ideas, to evaluate what's feasible. To do that, I believe we need to get some Web map developers from OpenLayers (for example), and/or OpenStreetMap etc., say, to help us with the user experience and so on.

[NickFitz]

It seems to me that this capability is likely to duplicate much of what is said at https://maps4html.github.io/HTML-Map-Element-UseCases-Requirements/#capability-marker-points if it attempts to get into definitions of “marker” and so on, so I intend to link to that capability for background, and restrict this one to consideration of the API-related aspects of adding markers. Does that seem reasonable?

[Malvoz]

Moving the current definition of "marker" ("A map marker is a small icon that marks a point feature.") from #capability-marker-points to the glossary section makes the most sense, to me at least.