How to set attribute in XML using XSLT?

Question

For example, I want to add an attribute to this node:

<Party> 

So it will look like:

<Party role="this should be set using XPath"> 

Attribute value has to come from XPath.

The following will not work :)

<Party role=<xsl:value-of select="some/xpath/path"/>> 

How to do that?

Answer 1

Attributes of literal result elements support the attribute value template syntax, using {}:

<Party role="{some/xpath/path}"> 

Answer 2

<xsl:template match="Party">   <Party role="{some/xpath/path}">     <xsl:apply-templates select="@* | node()"/>   </Party> </xsl:template> 

should do. As an alternative

<xsl:template match="Party">   <xsl:copy>     <xsl:attribute name="role" select="some/xpath/path"/>     <xsl:apply-templates select="@* | node()"/>   </xsl:copy> </xsl:template> 

Of course the apply-templates is only necessary if there are attribute and/or child nodes you also want to be processed (for example to be copied by an identity transformation template).