xpur

Index > Books > Declarative Development Guide > Reference Library > Accessor Listing > xpur

Module

urn:org:ten60:netkernel:ext:xml:ura

Definition

Active URI Base

active:xpur

Format

Syntax

Argument	Rules	Description
type	Mandatory	xpur
operand	Mandatory	the resource containing a URI
operator	Mandatory	a canonical XPath document
target	Mandatory Fragment OK	the target resource

The xpur accessor returns a canonical URI extracted from an XPath location in the operand document. The XPath location is supplied by the operator as a canonical XPath document.

Documents frequently contain URI's that are needed for subsequent processing. This accessor extracts the value at a given xpath location and casts it to a canonical URI.

Here's an example...

<instr>
  <type>xpur</type>
  <operand>
    <example>
      <someresource the_uri_to_my_resource="file:/some/resource.xml">
        <desc>My resource</desc>
      </someresource>
    </example>
  </operand>
  <operator>
    <xpath>/example/someresource/@the_uri_to_my_resource</xpath>
  </operator>
  <target>var:uri</target>
</instr>

Produces a value in var:uri...

<uri>file:/some/resource.xml</uri>