xsl:sort element is used within an
saxon:group element to indicate the order in which the selected elements are processed.
select attribute (default value ".") is a string expression that calculates the sort
order attribute (values "ascending" or "descending", default "ascending") determines
the sort order. There is no control over language, collating sequence, or data type.
data-type attribute determines whether collating is based
on alphabetic sequence or numeric sequence. The permitted values are either "text" or "number", or
a built-in type in XML Schema, such as
collation attribute is the name of a collating sequence. If present it must be a collation URI
recognized by Saxon: see Implementing a collating sequence.
case-order attribute (values "upper-first" and "lower-first") is relevant only for
data-type="text"; it determines whether uppercase letters are sorted before their lowercase equivalents,
The value of the
lang attribute can be an ISO language code such as "en" (English) or
"de" (German). It determines the algorithm used for alphabetic collating. The default is based on
the Java system locale. The value is used to select a collating sequence associated with the Java Locale
for that language.
Several sort keys are allowed: they are written in major-to-minor order.
Example 1: sorting with xsl:apply-templates. This example shows a template for a BOOKLIST element which processes all the child BOOK elements in order of their child AUTHOR elements; books with the same author are in descending order of the DATE attribute.<xsl:template match="BOOKLIST"> <h2> <xsl:apply-templates select="BOOK"> <xsl:sort select="AUTHOR"/> <xsl:sort select="@DATE" order="descending" lang="GregorianDate"/> </xsl:apply-templates> </h2> </xsl:template>
Example 2: sorting with xsl:for-each. This example also shows a template for a BOOKLIST element which processes all the child BOOK elements in order of their child AUTHOR elements.<xsl:template match="BOOKLIST"> <h2> <xsl:for-each select="BOOK"> <xsl:sort select="AUTHOR"/> <p>AUTHOR: <xsl:value-of select="AUTHOR"></p> <p>TITLE: <xsl:value-of select="TITLE"></p> <hr/> </xsl:for-each> </h2> </xsl:template>