Editor improvements related to DCAT support

[fxprunayre]

Editor config

• Side panel can now contain sections

Keywords

• Add possibility to use the virtual all thesaurus to populate simple keyword structure
• Add xpath mode to gnKeywordSelector directive

• Fix XML API edits (trim XML snippet, detect self closing tags, ignore gn_delete tag)

Subtemplates

• Add a new taginput mode to be able to populate contact like keywords

To enable it use the following configuration.

 <for name="dct:creator" addDirective="data-gn-directory-entry-selector">
      <directiveAttributes
        data-template-type="contact"
        data-element-xpath="./dcat:Dataset/dct:creator"
        data-max-tags="1"
        data-insert-modes="tags"
        data-values="xpath::string-join(.//dct:creator/@xlink:href, '◿')"
        data-default-role="creator"
        data-transformation="contact-from-iso19139-to-foaf-agent"/>
    </for>

In this mode, encoding is made using XLinks (so turn XLink resolution on in the admin > settings).

This mode does not work (yet?) for ISO records where the role has to be set. But the configuration would look like that:

    <for name="gmd:pointOfContact" addDirective="data-gn-directory-entry-selector">
      <directiveAttributes
        data-template-type="contact"
        data-insert-modes="tags"
        data-element-xpath="gmd:identificationInfo/*/gmd:pointOfContact"
        data-values="xpath::string-join(*/gmd:pointOfContact/@xlink:href, '◿')"
        data-default-role="pointOfContact"
        data-variables="gmd:role/gmd:CI_RoleCode/@codeListValue~{role}"/>
    </for>

Geometry

• Add possibility to define a wrapper element (currently only ISO19139 can use the polygon directive)
• Add utility to parse WKT to simple extent string

Label

• Attributes may have context element for more contextual label (eg. use for rdf:resource or rdf:about in DCAT)