I'm familiar with SPARQL, but when talking about SPARQL & linked data with people, occasionally they make comments about SPARQL not being a good query language, or having issues with the spec.
So, naturally, I'd like to know, what other query languages exist for querying linked data?
As far as I know, SPARQL is the W3C recommended language for RDF and it is pretty powerful. But if you want to build a tool which will query linked data, then you might wanna take a look at Jena. Its a java API library for handling RDF and its pretty powerful. Also, I had come across another language called, XSPARQL , which gives a nice interoperability between SPARQL and XQuery. If you are familiar with XQuery and SPARQL, you might find XSPARQL useful
