XML 1.1 (with XML Namespaces 1.1) extends XML 1.0 in three ways:
The set of valid characters is increased
The set of characters allowed in XML Names is increased
Namespace undeclarations are permitted.
Saxon is capable of working with XML 1.1 input documents. If you want to use Saxon with XML 1.1, you
should set the option "-1.1" on the Saxon command line, or call the method
configuration.setXMLVersion(Configuration.XML11) or, in the case of XSLT,
transformerFactory.setAttribute(FeaturesKeys.XML_VERSION, "1.1")
This configuration setting affects:
validation of names used in XQuery and XPath expressions, including names of elements, attributes, functions, variables, and types
validation of names of constructed elements, attributes, and processing instructions in XQuery and XSLT
schema validation of values of type xs:NCName, xs:QName, xs:NOTATION, and xs:ID
the permitted names of stylesheet objects such as keys, templates, decimal-formats, output declarations, and output methods
the characters considered valid in the source of an XQuery query
the characters considered valid in the result of the functions codepoints-to-string() and unparsed-text()
the characters considered valid in the result of certain Saxon extension functions
the way in which line endings in XQuery queries are normalized
the default version used by the serializer (with output method XML)
Note that if you use the default setting of "1.0", then supplying an XML 1.1 source document as input may cause undefined errors.
It is advisable to use an XML parser that supports XML 1.1 when the configuration is set to "1.1", and an XML parser that does not support XML 1.1 when the configuration is set to "1.0". However, Saxon does not enforce this.
You can set the configuration to allow XML 1.1, but still serialize result documents as XML 1.0 by
specifying the output property version="1.0". In this case Saxon will check while serializing
the document that it conforms to the XML 1.0 constraints (note that this check can be expensive). These checks
are not performed if the configuration default is set to XML 1.0.
If you want the serializer to output namespace undeclarations, use the output property
undeclare-namespaces="yes" as well as version="1.1".
