This is the case thanks to the
systematic use of the aforementioned tags and metadata, however the ongoing developments
in the domain of the Semantic Web (see projects such a DBpedia.org or Freebase.com)
suggest that similar metrics will be richer and more precise in the foreseeable future.
Moreover, organizations developing open licensing tools, such as Creative Commons, also
offer to the public rich systems of metadata which can already be used to monitor the re-use
of licensed content (Abelson et al. 2008 ).