Svg.IdSourceNode identifiers.
The type of global SVG element identifier.
The function new_elt_id () creates a new HTML5 element identifier. (see the Eliom manual for more information on
<<a_manual project="eliom" chapter="clientserver-html"
fragment="global"|global element>>).
The function create_named_elt ~id elt create a copy of the element elt that will be accessible through the name id.
The function create_named_elt elt is equivalent to create_named_elt ~id:(new_elt_id ()) elt.