Re: sub-tree filtering proposals

[Juergen Schoenwaelder <j.schoenwaelder@iu-bremen.de>]

On Mon, Jun 07, 2004 at 10:23:17AM -0700, Andy Bierman wrote:
 
> How can multiple element and/or attribute selectors be combined?

As Joel M. Halpern already pointed out in private email, you can
have multiple [] selections, for example:

//interface[type="ethernet"][connector="present"]

I am assuming here an interface representation such as:

    <interface>
      <name>eth0</name>
      <type>ethernet</type>
      <connector>present</connector>
      <!-- lots of other stuff -->
    </interface>

The same works for attributes and things can even be nested. Assuming
an SNMP message in XML format, a valid expression would be:

//snmp[version="1"][community="public"]/pdu[@type="getnext"]

This would match a document such as the following:

    <snmp length="42">
      <version>1</version>
      <community>public</community>
      <pdu type="getnext">
        <request-id>1804289385</request-id>
        <error-status>0</error-status>
        <error-index>0</error-index>
        <varbind>
          <name>1.3.6.1.2.1.1.3</name>
          <value/>
        </varbind>
      </pdu>
    </snmp>

[Don't worry about the strange example - this is simply copied from some
 stuff I am working on today and by no means represents any reasonable 
 data model for netconf.]

/js

-- 
Juergen Schoenwaelder		    International University Bremen
<http://www.eecs.iu-bremen.de/>	    P.O. Box 750 561, 28725 Bremen, Germany

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