A RDF query language is a computer language able to retrieve and manipulate data stored in Resource Description Framework format.

SPARQL is emerging as the de-facto RDF query language, and is a W3C Recommendation^[1]. Released as a Candidate Recommendation in April 2006, it returned to Working Draft status in October 2006, due to open issues. It returned to Candidate Recommendation status in June 2007^[2]. On 12th November 2007 the status of SPARQL changed into Proposed Recommendation. ^[3] On 15th January 2008, SPARQL was standardized. ^[4]

Other RDF query languages

• DQL, XML-based, queries and results expressed in DAML+OIL
• N3QL, based on Notation 3
• R-DEVICE
• RDFQ, XML-based
• RDQ, SQL-like
• RDQL, SQL-like
• RQL/RVL, SQL-like
• SeRQL, SQL-like, similar to RQL/RVL
• Versa (query language), compact syntax (non–SQL-like), solely implemented in 4Suite (Python)
• XUL has a template element in which to declare rules for matching data in RDF. XUL uses RDF extensively for databinding.
• Adenine (programming language written in RDF).

External links

• RDF Query specification
• RDF query language survey
  • A Comparison of (some) RDF Query Languages
• RDF query use cases, including query language samples
• SparQL

References

1. ^ SPARQL Query Language for RDF
2. ^ W3C Semantic Web Activity News - SPARQL is a Candidate Recommendation
3. ^ Archive of W3C News in 2007
4. ^ W3C Semantic Web Activity News - SPARQL is a Recommendation