DcDCAT-AP provides a way for Distributions to specify the license, but many (most) open data licenses include an "attribution" clause (for instance, CC-BY and the Flemish license for free re-use). It is currently not possible to specify how attribution should be done.
Some work has been done in this field:
- The The Creative Commons Rights Expression Language (ccREL) provides a way to specify the name and/or URL which should be mentioned through the properties: http://creativecommons.org/ns#attributionURL and http://creativecommons.org/ns#attributionName
- The ODI's Open Data Rights Statement Vocabulary (ODRS) provides similar properties such as http://schema.theodi.org/odrs/#attributionText and http://schema.theodi.org/odrs/#attributionURL
Further relevant work is done by http://rightsstatements.org/
In the case of the Flemish licenses, it is important to allow publishers to specify a textual (Literal) description of the attribution. The nearest fit to this requirement seems to be ODRS' attributionText.
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It looks like the ODRS approach is closest to this requirement as it allows both a text field and a link to a further information about the licence: "a reference to the dataset or publisher homepage, but may also be a dedicated attribution page”. There is also a useful guide with examples for the use of ODRS at http://theodi.org/guides/publishers-guide-to-the-open-data-rights-statement-vocabulary.
The Creative Commons approach only provides a field for a URL to be "used when attributing re-use" and no text field for the description of the licence.
The work of http://rightsstatements.org/ concentrates more narrowly on expression of copyright.
We would welcome further comments and suggestions.