xsl:accumulator-rule

Defines a rule for an xsl:accumulator.

Content: sequence-constructor
Permitted parent elements: xsl:accumulator

Attributes

match

pattern

Pattern defining the set of nodes to which the accumulator rule applies.

phase?

"start" | "end"

Determines whether the rule fires before or after descendants are processed, by specifying phase="start" (the default) or phase="end" respectively.

select?

expression

The expression to be evaluated by the rule may be given either by a select attribute, or by an enclosed sequence constructor.

saxon:capture?

The value "yes|true|1" on a phase="end" rule for a streaming accumulator removes the requirement for the select attribute (or sequence constructor) to be motionless. Instead the expression has access to a snapshot of the streamed node (in the sense of the fn:snapshot function). For example, writing select="($value, .)" ensures that the value of the accumulator contains a sequence of snapshot copies of all the element nodes matched by the accumulator rule. For details see saxon:capture.

Examples

For an example of the use of a capturing accumulator rule to construct the glossary of a document, see the blog article Capturing Accumulators.

Links to W3C specifications

XSLT 3.0 Specification

See also

xsl:accumulator