http://www.w3.org/1999/XSL/Transform

c.instanceOf ([target : xlink], schemaLocation : string) : boolean

The function instanceOf checks, if the underlying data type of the xlink equals or is derived from the given type.

If the argument xlink is not specified, the data object of the current rendering context is used.

<xsl:value-of select="c.instanceOf('Onion:http://www.getit.de/2006/structure/node')" />

Type checking of the current object