JAXP 1.3/1.4 specs require to support XML 1.1 and Namespaces 1.1 (JSR 206 http://jcp.org/en/jsr/detail?id=206). However StAX parser implementation added into JAXP 1.4
doesn't support XML 1.1 and Namespaces 1.1. Note that XML 1.1 and Java SE 5.0 and higher
supports Unicode 4.x. XML 1.0 supports Unicode 2.x. To make JAXP and Java SE specs
and implementation consistent all components of JAXP should better support the same
versions of XML, Unicode, Namespaces

Attached test case reports the following message:

> java XML11StAXTest valid ibm02v01.xml
Warning: validation is not supported by StAX parser.
java.lang.IllegalArgumentException: true value of isValidating not supported
Fatal error: null(1,20): ParseError at [row,col]:[1,20]
Message: XML version "1.1" is not supported, only XML 1.0 is supported.
javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,20]
Message: XML version "1.1" is not supported, only XML 1.0 is supported.
Test failed!