saxon:array instruction is used to create an array from a sequence of items.
Like the "curly array constructor" in XPath 3.1, each member of the created array will be a singleton
Permitted parent elements: any XSLT element whose content model is sequence-constructor; any literal result element
The contents of the array may be given either by an expression in the
The content model is the same as
xsl:sequence: either a
or a contained sequence constructor, but not both. The effect is the same as evaluating the equivalent
xsl:sequence instruction and then passing the result into a curly array constructor.
The following example groups transaction elements by date, returning the result as a nested array structure: specifically, an outer array, itself containing arrays of transaction elements, where all the transactions for a particular day are grouped as members of an inner array.<xsl:variable name="groups" as="array(array(element(*))"> <saxon:array> <xsl:for-each-group select="transaction" group-by="@date"> <saxon:array select="current-group()"/> </xsl:for-each-group> </saxon:array> </xsl:variable>
Rather than binding the resulting array to a variable, another useful technique is to serialize
it as JSON using
<xsl:output method="json" build-tree="no"/>.