xml namespace handling in XmiCasDocSerializer / NPE with Saxon in classpath
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Key: UIMA-1817
URL: https://issues.apache.org/jira/browse/UIMA-1817
Project: UIMA
Issue Type: Bug
Components: Core Java Framework
Affects Versions: 2.3
Environment: Java 1.6.0_20, Saxon9 jars on the classpath
Reporter: Martin Schaffoener
While experimenting with UIMA I observed a problem similar to the one already
posted here: http://tinyurl.com/32spzv9. Since removing Saxon from the
classpath was not an option, I found the problem to be the way namespaces are
handled in org.apache.uima.cas.impl.XmiCasSerializer$XmiCasDocSerializer.
First of all, the addAttribute/3 method was incorrectly passing null as uri and
localName parameters. According to the javadoc, these must at least be empty
strings. I added a hack to extract the localName from the qName, if available.
Second, the method computeNamespaceDeclarationAttrs/1 only added namespaces as
attributes, which are not honored by Saxon. I think this is correct, as the
SAX2 standard states that namespaces must be declared via startPrefixMapping/2,
so I added that, as well.
Attached you find a patch with changes which work for me (and seem to solve the
problem).
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