Apache Jena 3.1.0 发布了，Jena是一个Java工具箱用于开发基于RDF与OWL语义(semantic)Web应用程序。它提供了一个RDF API；ARP，一个RDF解析器；SPARQL，W3C RDF查询语言；一个OWL API；和基于规则的RDFS与OWL接口。
改进记录如下：
* In-memory transactional dataset
contributed by Adam Soroka
with thanks to the University of Virginia Library for
providing the time for Adam to work on this.
* SPARQL extension for CONSTRUCT Quads (RC)
contributed by Qihong Lin
with thanks to the Google Summer of Code scheme
for sponsoring Qihong on this project.
* New custom functions and aggregate functions
Added:
+ afn:sprintf (contribution from Alessandro Seganti)
+ The XQuery/XPath Functions and Operators "math:" functions
+ Custom aggregates for stdev etc. (also STDEV etc as keywords).
* Logging - log4j marked <optional>
* Fuseki: Allow multiple service per file, shared datasets
* OSGi fixes (Jaroslav Pullmann)
* Consistent support for transactions in DatasetGraphs
* New module jena-cmds
* JSON result type fix: "literal" not "type": "typed-literal"
* Space saving when parsing (FactoryRDF)
Parsing RDF now saves space by partial interning RDFTerms
created during a each parser run.
* Improvements to jena-text to include more text query parsers
(Osma Suominen)