Hello, I have been trying to speed up the parsing of RDF/XML in Apache Jena.
The reason is that our customers are introducing new data formats. This involves replacing small (<1MB) ASCII files originating from punch cards with large (>40MB) RDF/XML formats. However, the expectation is that the processing speed will not increase. ;-) The first thing I tried was to integrate other parsers than Xerces. But when I added the dependencies, also the unchanged riot/lang/rdfxml implementations started to use either woodstox or aalto. The reason was in org.apache.jena.riot.lang.rdfxml.SysRRX, where " XMLInputFactory.newInstance();" is used. To continue my comparisons, I used "XMLInputFactory.newDefaultFactory()" instead. --> So, when I bundle Jena with another application where aalto is a dependency, aalto may be used? If this is potentially dangerous, as mentioned in https://issues.apache.org/jira/browse/JENA-2331, shouldn´t we use " XMLInputFactory.newDefaultFactory()" to ensure, that no unknown 3rd party parser is used? In my benchmarks, woodstox is a bit faster than the default, but with larger files aalto is even faster. Unfortunately aalto seems to be almost inactive. Do you have any suggestions on fast xml parsers or is there any work on a faster rdf/xml parser? Arne
