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Align XSLT with working draft of GeoDCAT-AP 2.0.0 (#2)
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This version includes revisions needed to ensure compliance with DCAT 2 and DCAT-AP 2.0, and reflecting the first working draft of GeoDCAT-AP 2.0.0:

https://semiceu.github.io/GeoDCAT-AP/drafts/2.0.0-draft-0.1/

Such revisions are implemented in a conservative way - i.e., by adding new mappings without removing the original ones, but flagging them as deprecated, thus ensuring backward compatibility. 

Another main change concerns having moved to the core profile some mappings which were originally part of the extended profile only, and concerning metadata elements supported in DCAT-AP 2.

Finally, this new version includes revisions to ensure compliance with the 2017 edition of the INSPIRE Metadata Implementation Guidelines. Also in this case, revisions have been implemented in a conservative way, to ensure backward compatibility with metadata records following previous versions of the INSPIRE Metadata Technical Guidelines.

More precisely:

* Updated licence version, attribution, and links.
* Switched to DCAT-AP and GeoDCAT-AP namespace URIs to denote, respectively, the core and extended GeoDCAT-AP profile. Backward compatibility with the previous versions is ensured, where codes "core" and "extended" were used instead.
* Added mappings for new classes and properties included in DCAT-AP 2:
    * `dcat:DataService`.
    * `dcat:endpointURL`.
    * `dcat:endpointDescription`.
    * `dcat:accessService`.
    * `dcat:servesDataset`.
    * `dcat:bbox`.
    * `dcat:startDate`.
    * `dcat:endDate`.
    * `dcat:spatialResolutionInMeters`
    * `dcat:hadRole`.
* Added mappings for properties with a broader domain in DCAT-AP 2:
    * `dcat:theme`.
    * `dcat:keyword`.
    * `dcat:contactPoint`.
* Moved to core profile mappings originally supported only in the extended profile:
    * Resource type "service".
    * Resource types.
    * Service types.
    * Constraints related to access and use for services.
    * Conformity (only in case the resource is conformant).
    * Metadata standard.
    * Responsible party role "author".
    * Spatial resolution.
    * Spatial reference system.
* Mappings revised and added to ensure compliance with the 2017 edition of the INSPIRE Metadata Technical Guidelines:
    * Revised and added mappings for conditions for limitations on public access and conditions for access and use. In particular, element `gmd:useConstraints` is now used to map use conditions. The previous versions of the mappings used instead element `gmd:useLimitation`, which has been kept for backward compatibility, but flagged as deprecated.
* Enhancements:
    * Added checks for empty elements.
    * Revised mapping for reference systems, to include also values specified via `gmx:Anchor`.
    * Revised mapping for spatial resolution, to extend detection of unit of measurements.
    * Revised mapping for constraints on access and use, to include also values specified via `gmd:MD_RestrictionCode` and `gmx:Anchor`.
    * Revised mapping for distributions, to include reference to the relevant service / API via `dcat:accessService`. One major difference with respect to the previous versions of the mapping is that resource locators are considered as distributions of datasets and series whenever they point to a service / API.
    * Revised mapping for time literals, to detect their data type.
    * Revised mapping for temporal extent, to core with the use of versioned `gml:` namespaces.
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andrea-perego authored Oct 27, 2020
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Unless specified otherwise, the entries in this changelog apply to file [`iso-19139-to-dcat-ap.xsl`](./iso-19139-to-dcat-ap.xsl).

## 2020-06-22: New version (v2.0)

This version includes revisions needed to ensure compliance with DCAT-AP 2. Such revisions are implemented in a conservative way - i.e., by adding new mappings without removing the original ones, but flagging them as deprecated, thus ensuring backward compatibility.

Another main change concerns having moved to the core profile some mappings which were originally part of the extended profile only, and concerning metadata elements supported in DCAT-AP 2.

Finally, this new version includes revisions to ensure compliance with the 2017 edition of the INSPIRE Metadata Implementation Guidelines. Also in this case, revisions have been implemented in a conservative way, to ensure backward compatibility with metadata records following previous versions of the INSPIRE Metadata Technical Guidelines.

More precisely:

* Updated licence version, attribution, and links.
* Switched to DCAT-AP and GeoDCAT-AP namespace URIs to denote, respectively, the core and extended GeoDCAT-AP profile. Backward compatibility with the previous versions is ensured, where codes "core" and "extended" were used instead.
* Added mappings for new classes and properties included in DCAT-AP 2:
* `dcat:DataService`.
* `dcat:endpointURL`.
* `dcat:endpointDescription`.
* `dcat:accessService`.
* `dcat:servesDataset`.
* `dcat:bbox`.
* `dcat:startDate`.
* `dcat:endDate`.
* `dcat:spatialResolutionInMeters`
* `dcat:hadRole`.
* Added mappings for properties with a broader domain in DCAT-AP 2:
* `dcat:theme`.
* `dcat:keyword`.
* `dcat:contactPoint`.
* Moved to core profile mappings originally supported only in the extended profile:
* Resource type "service".
* Resource types.
* Service types.
* Constraints related to access and use for services.
* Conformity (only in case the resource is conformant).
* Metadata standard.
* Responsible party role "author".
* Spatial resolution.
* Spatial reference system.
* Mappings revised and added to ensure compliance with the 2017 edition of the INSPIRE Metadata Technical Guidelines:
* Revised and added mappings for conditions for limitations on public access and conditions for access and use. In particular, element `gmd:useConstraints` is now used to map use conditions. The previous versions of the mappings used instead element `gmd:useLimitation`, which has been kept for backward compatibility, but flagged as deprecated.
* Enhancements:
* Added checks for empty elements.
* Revised mapping for reference systems, to include also values specified via `gmx:Anchor`.
* Revised mapping for spatial resolution, to extend detection of unit of measurements.
* Revised mapping for constraints on access and use, to include also values specified via `gmd:MD_RestrictionCode` and `gmx:Anchor`.
* Revised mapping for distributions, to include reference to the relevant service / API via `dcat:accessService`. One major difference with respect to the previous versions of the mapping is that resource locators are considered as distributions of datasets and series whenever they point to a service / API.
* Revised mapping for time literals, to detect their data type.
* Revised mapping for temporal extent, to core with the use of versioned `gml:` namespaces.

## 2016-11-28: Revised version (v1.13)
* Added mappings for multilingual elements. More precisely, these mappings concern the following elements:
* Metadata standard name.
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