The <xslt> element

The xslt element of the configuration file contains properties specific to XSLT. Remember that these are defaults; they can always be overridden for specific queries or transformations. An attribute whose value is set to a zero-length string is ignored: the effect is the same as omitting the attribute.

Attribute	Applies to	Values	Effect
`disableXslEvaluate`	EE	true\|false	If set, the use of the `xsl:evaluate` instruction in XSLT 3.0 is disabled.
`enableAssertions`	PE EE	true\|false	Indicates whether assertions (XSLT 3.0 xsl:assert instructions) are enabled.
`initialMode`	HE PE EE	A mode name (QName in Clark notation `{uri}local`)	The name of a mode within a stylesheet in which execution should begin.
`initialTemplate`	HE PE EE	A template name (QName in Clark notation `{uri}local`)	The name of a named template within a stylesheet where execution should begin.
`messageEmitter`	HE PE EE	Name of a class implementing Receiver	Destination of xsl:message output.
`outputUriResolver`	HE PE EE	Name of a class implementing OutputURIResolver	Handles documents written using xsl:result-document.
`recoveryPolicy`	HE PE EE	recoverWithWarnings\|recoverSilently\| doNotRecover	Previously used to indicate how XSLT recoverable errors were handled, but since the XSLT 3.0 specification has eliminated these, the property is now deprecated.
`resultDocumentThreads`	EE	integer	Indicates the maximum number of threads to be used for processing `xsl:result-document` instructions in parallel.
`schemaAware`	EE	true\|false	Indicates whether stylesheet should be compiled to be able to handle schema-typed input, even if they contain no xsl:import-schema declaration.
`staticErrorListener`	HE PE EE	Name of a class implementing the JAXP `javax.xml.transform.ErrorListener` interface	Receives reports of compile-time errors in a stylesheet.
`staticUriResolver`	HE PE EE	Name of a class implementing the JAXP `javax.xml.transform.URIResolver` interface	User-defined class for dereferencing URIs on xsl:include or xsl:import.
`strictStreamability`	EE	true\|false	Causes the XSLT processor to verify that constructs that are declared streamable are in fact "guaranteed streamable" according to the W3C rules.
`styleParser`	HE PE EE	Name of a class implementing the `org.xml.sax.XMLReader` interface	XML parser used for stylesheets and schema documents.
`version`	HE PE EE	0.0, 2.0, or 3.0	XSLT language version to be supported by the processor. From Saxon 9.8, an XSLT 3.0 processor is always used by default. So setting this property has no effect.
`versionWarning`	HE PE EE	true\|false	False suppresses the warning produced when the XSLT processor version is not the same as the version in the `xsl:stylesheet` element. From Saxon 9.8, the warning is no longer output, so this attribute is ignored.

The xslt element may also contain one or more extensionElement children defining namespaces used for extension instructions. Each extensionElement element must have the following attributes:

Attribute	Applies to	Values	Effect
`factory`	PE EE	Name of class implementing the Saxon interface ExtensionElementFactory	Links to the implementation of the various extension instructions in the specified namespace.
`namespace`	PE EE	A namespace URI	The namespace URI of the extension instructions.