Implicit joins idea seems has already been expressed in SPARQL http://thefigtrees.net/lee/sw/sparql-faq#benefits http://thefigtrees.net/lee/sw/sparql-faq#benefi

Implicit joins idea seems has already been expressed in SPARQL http://thefigtrees.net/lee/sw/sparql-faq#benefits http://thefigtrees.net/lee/sw/sparql-faq#benefits In my view, a good query language should support tool-free DSL-ization. Meaning that it should be easy to express data model entities in a DSL for a specific data model. I also think that a data architect should provide as one of the most important artifacts of his/her data model, a query DSL for the data in his/her model. This way the users of the data model will be using a type-safe DSL to get the data. So to me the biggest limitation of SQL or even SPARQL or the authors' proposal in the referenced article -- is the lack of DSL construction features that can reflect a relational or graph oriented data model