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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: RDF storage
 > and the arising problems? the most difference betwwen RDF > and pure XML is the data model which is hierarchical tree for XML > and graph for RDF.so if storing RDF in NXD,maybe it is > needed to redesign the storage model and also mapping rdf query > like RQL into XML query language like XQuery. > It seems that the most appealing thing to store RDF in NXD > is that i can utilize the index and other optimizing You are correct; the difference in data model makes it difficult to get any advantage from Xquery. The same applies to indexing though. The idices which are supported by native XML databases are not RDF-aware. However, we could make the same criticism of relational databases -- the RDF data model is not at all like the relational data model; so vendors have been forced to implement custom indexing and query schemes atop relational engines. Since it requires a lot of custom work either way, I do not think that either relational or native-XML have a distinct advantage over the other, except for the fact that relational engines are more mature, and targeting relational makes it easier to port a RDF engine to multiple platforms. A native XML database would perhaps have an easier time preserving the full fidelity of the input RDF documents, but it is also possible for a relational-backed engine to store the source RDF in a CLOB when shredding the RDF to relational tables. 
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