Linked Data Is Merely More Data / quote 3 of 5
Lack of conceptual description in the linked data cloud
...the user has to be familiar with multiple datasets, and has to express the precise relationships between concepts in the RDF triple pattern, which even in trivial scenarios implies browsing at least two to three datasets. In our previous work (Jain et al. 2009) we made progress towards alleviating this obstacle. [...] This is perfectly fine from a knowledge engineering perspective, but it makes the querying of the cloud difficult as it requires users to understand the various heterogeneous schemas.