Using keywords vs URIs in com:Annotation's

[andrea-perego]

In Appendix VI.1, the StatDCAT-AP specification provides examples on how to use com:Annotation's to specify StatDCAT-AP metadata.

For doing this, elements com:AnnotationTitle and com:AnnotationType are used with keywords denoting, respectively, the relevant RDF property (e.g., dcat:accessURL) and the metadata profile (StatDCAT-AP). E.g.:

<com:Annotation>
  <com:AnnotationTitle>dcat:accessURL</com:AnnotationTitle>
  <com:AnnotationType>StatDCAT-AP</com:AnnotationType>
  <com:AnnotationURL>http://www.ec.europa.eu/eurostat/SDMX/diss-web/rest/</com:AnnotationURL>
</com:Annotation>

I wonder whether it would be preferable, to avoid any ambiguity, to use not keywords, but the corresponding URIs. E.g.:

<com:Annotation>
  <com:AnnotationTitle>http://www.w3.org/ns/dcat#accessURL</com:AnnotationTitle>
  <com:AnnotationType>http://data.europa.eu/xyz</com:AnnotationType>
  <com:AnnotationURL>http://www.ec.europa.eu/eurostat/SDMX/diss-web/rest/</com:AnnotationURL>
</com:Annotation>

where the fictitious URI http://data.europa.eu/xyz corresponds to the namespace URI of StatDCAT-AP.