The second post of the Problems of Linked Data series is about the problems regarding the concept of Linked Data:
In the Linked Data context, a node of the Web of data is redirected to the document containing its description. “Data” (or “datum”, if you’re pedantic) as the basic unit of this new Web of data, represents a new paradigm that needs to take over the role that the “document” had before. However, this idea is not fully elaborated, and documents still exist as data containers. In other words, the data structure is “glued” onto the (2D) document instead of being implemented via (3D) HTTP URIs.
Creating the Web of data is a challenge because an RDF graph and the Web graph are two different types of graphs. Arcs (links) in an RDF graph have names, while hyperlinks on the Web have only direction. Another problem is the fact that in an RDF graph, out of three types of nodes only URI references are identified by an URI. How to follow the idea of Web documents and assign each “data” on the Web of data a URI, when blank nodes and literals have no URI? On the Web of documents, every document has a URI, there are no “blank documents” and “literal documents”.
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Stay tuned, more to come soon!