XML in a Nutshell, 3rd Edition

Name

xsl:param

Synopsis

<xsl:param 
  name   = "QualifiedName"
  select = "expression"> 
 <! --  template  -- >
</xsl:param>

Inside an xsl:template element, an xsl:param element receives a named argument passed to the template by xsl:with-param. It also provides a default value that’s used when the caller does not provide a value for the parameter. A top-level xsl:param element defines a global variable that can be set from the outside environment when invoking the stylesheet. If an xsl:apply-templates or xsl:call-template passes in a parameter value using xsl:with-param when the template is invoked, that value overrides any default value the xsl:param element may have. The parameter can be dereferenced using the form $ name in expressions.

Attributes

name, required

The parameter’s name.

select, optional

An XPath expression that is evaluated to produce the parameter’s value. If xsl:param has a select attribute, then it must be an empty element. If a nonempty xsl:param element does not have a select attribute, then the value is the result of instantiating the template in the content. If an empty xsl:param element does not have a select attribute, then the value is the empty string.

Contents

An xsl:param element’s content is a template that is instantiated to produce a result-tree fragment. This result-tree fragment then becomes the parameter’s value. A nonempty xsl:param element must not have a select attribute.