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.
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.