The <patternOptimization> element

Techniques described here are experimental and only available in Saxon-EE.

The xslt element may contain one or more patternOptimization children defining pattern optimizations for template rule matching. The patternOptimization element has the following attributes:

Attribute	Applies to	Values	Effect
dita	EE	true\|false	Whether to apply indexation for generic predicated template rules in the DITA-OT framework. Default `false`. For more information see the DITA-OT optimization.
index.comparison.predicates	EE	true\|false	Whether to apply indexation for generic value-comparison predicated template rules (`*[exp=value]`). Default `false`. For more information see the Indexation of rule comparison predicates.
index.minUses	EE	xs:integer	The minimum number of rules that share some common indexation to build an index. Default `6`.
index.rules	EE	true\|false	Whether indexes for rules should be generated from configuration-supplied indexation patterns. Default `false`, in the absence of `<index>` children.
optimize	EE	true\|false	Whether to carry out any rule optimization. Default `true` if a `<patternOptimization>` element has been defined. (This allows a simple switch off by defining `optimize="false"`)
precondition.minUses	EE	xs:integer	The minimum number of uses a precondition needs to be considered for application. Default `2`.
preconditions	EE	true\|false	Whether to generate pattern-directed preconditions for rules. Default `false`, in the absence of `<precondition>` children.

Currently there are three different forms of optimization:

The third is highly experimental, requires detailed knowledge of XPath models and is not recommended for any production purposes.