From: "Kyle X." <haebooty@...>
Date: 2011-04-20T05:42:12+09:00
Subject: Re: Can you search in REXML by attributes?

Hello, Nokogiri has been going well for me but recently I have been
having trouble trying to read some xml, and from my reading online I
cannot find the proper way to write it using Nokogiri.  Here are the two
lines I am having trouble with:

1)
<IfcWallStandardCase id="i17855">
  <Representation>
    <IfcProductDefinitionShape id="i17925">
      <Representations id="i17928" exp:cType="list">
        <IfcShapeRepresentation exp:pos="0" xsi:nil="true"
ref="i17886"/>
        <IfcShapeRepresentation exp:pos="1" xsi:nil="true"
ref="i17919"/>
      </Representations>
    </IfcProductDefinitionShape>
  </Representation>
</IfcWallStandardCase>

I am trying to get the reference for exp:pos="1", and I had this working
with using REXML with the following -

XPath.match( $doc, "//IfcWallStandardCase//*[@pos='1']" )

With nokogiri I can get it to read both pos 0 and 1, using .css and
.xpath-

$doc_noko.css("uosNS|IfcWallStandardCase uosNS|IfcShapeRepresentation",
{"uosNS" => $http})
and
$doc_noko.xpath("//uosNS:IfcWallStandardCase//uosNS:IfcShapeRepresentation",
{"uosNS" => $http})

But cannot figure out how to get it to read only pos=1 using either
method and continuously get error or nil.


2)
<IfcDirection id="i1574">
  <DirectionRatios id="i1577" exp:cType="list">
    <exp:double-wrapper pos="0">1.</exp:double-wrapper>
    <exp:double-wrapper pos="1">0.</exp:double-wrapper>
    <exp:double-wrapper pos="2">0.</exp:double-wrapper>
  </DirectionRatios>
</IfcDirection>

The issue I am having here is that I am reading this with Nokogiri using
.xpath and the colon in exp:double is giving me trouble since the xpath
is written -

ref = "i1574"
$doc_noko.xpath("//uosNS:*[@id='#{ref}']//uosNS:exp:double-wrapper",
{"uosNS" => $http}).map {|element| element.text}

I am guessing that it would be easier to use .css here rather than
.xpath.  So I have tried using it but cannot seem to get it correct.
Trying -

ref = "i1574"
$doc_noko.css("uosNS|#{ref} uosNS|exp:double-wrapper", {"uosNS" =>
$http}).map {|element| element.text}

As I read in a previous post that you call the ref using #{} for css,
but this returns nil for me.

Any ideas?

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