As described in [CoreMedia Content Application Developer Manual/Adding Document Metadata],
it is possible to include arbitrary metadata in Web documents by means of
the FreeMarker macro <@cm.metadata> or
the custom JSP tags <cm:metadata>, <cm:property> and
<cm:object>. In the rendered Web document, the different metadata chunks
are included as JSON-serialized values of the custom HTML attribute
data-cm-metadata of different DOM nodes. While metadata can be added using
FreeMarker or JSP, this section uses the JSP tags in its examples.
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