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 refer to a name
established using the
declaration in the stylesheet.
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 only collating sequence supplied with the Saxon product is "en" (English),
but other values may be supported by writing a user-defined comparison class. If no comparison class
is found for the specified language, a default algorithm is used which simply sorts according
to Unicode binary character codes. The value of lang does not have to be a recognized language
code, it is also possible to use values such as "month" to select a data-type-specific collating
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:sort select="@DATE" order="descending" lang="GregorianDate"/>
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.
<p>AUTHOR: <xsl:value-of select="AUTHOR"></p>
<p>TITLE: <xsl:value-of select="TITLE"></p>