Data theme vocabulary: mapping ISO 19115 to DCAT

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Description problem:
When mapping ISO 19115 metadata (MD_TopicCategoryCode - ISO 19139:2007) to DCAT-AP to the Dataset Theme Vocabulary you’ll see that a good mapping is not always possible. In those situations you have to pick a category that is not correct. In those cases you will create / introduce incorrect even if the theme in original ISO 19915 metadata are correct.

Some examples (nonlimitative) E.g. the ISO categories 'elevation' and 'imageryBaseMapsEarthCover' are difficult to map to Dataset Theme Vocabulary

Possible solutions:

• Create additional categories in Dataset Theme Vocabulary, so ISO 19115 can be mapped correctly to DCAT-AP
• Add extra category: ‘other’
• Make Dataset Theme Vocabulary optional for theme

Question Is it possible to implement one of the suggested solutions?