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XSLT, 2nd Edition by Doug Tidwell

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Name

<xsl:param>

Defines the name and value of a parameter to be used in a stylesheet. This element can appear as a top-level element or inside the <xsl:template> element. If the <xsl:param> appears as a top-level element, it is a global parameter, visible to all areas of the stylesheet. The default value of the parameter can be defined in one of two ways: specified in the select attribute or defined inside the <xsl:param> element itself. [2.0] In XSLT 2.0, <xsl:param> can also appear inside the new <xsl:function> element.

Category

Instruction.

Required Attribute

name

Defines the name of this parameter.

Optional Attributes

select

Contains an XPath expression that defines the value of this parameter.

[2.0 – Schema] as

Defines the datatype of this parameter. The datatype can be any of the built-in types or, if you have a schema-aware XSLT processor, a datatype defined in an XML Schema. For example, as="xs:integer" specifies a parameter that is a single integer, and as="xs:string*" specifies a parameter that is a sequence of zero or more strings. With a schema-aware XSLT processor, as="schema-element(po:purchase-order)" means that the parameter must be a valid po:purchase-order.

[2.0] required

Defines whether this parameter is required. Valid values are yes and no. If this is a parameter for an <xsl:function>, this attribute must not be defined. For stylesheet and template parameters, the default value is that the parameter is optional (required="no").

It is a static error if an <xsl:param> element ...

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