Searching for nodes using id attributes using xpathnavigator

Hi all,

I'm developing an automated localisation system in VB .NET, and I'm using an XML file for some of my parameters.

The following is a simplified version of the XML file I'm using:

<?xml version="1.0" encoding="UTF-8" ?>
   <versionInfo>
      <buildingBlocks>
         <buildingBlock id="1">
            <name>testname0</name>
            <buildingBlockGroup>group0</buildingBlockGroup>
            <files>
               <file id="00001" />
               <file id="00002" />
               <file id="00003" />
               ...
            </files>
         </buildingBlock>
         <buildingBlock id="222">
            <name>testname1</name>
            <buildingBlockGroup>group0</buildingBlockGroup>
            <files>
               <file id="00009" />
               <file id="00010" />
               <file id="00003" />
               <file id="00004" />
               ...
            </files>
         </buildingBlock>
         ...
      </buildingBlocks>
      <fileInfo>
         <files>
            <file id="00001" containsTranslatables="true" arch="mfc">
               <subpath>bin\fpl_str.exe</subpath>
               <language id="de-de" langType="source" lang="de-de" />
            </file>
            <file id="00002" containsTranslatables="true" arch="mfc">
               <subpath>bin\fpl_vdv.exe</subpath>
               <language id="de-de" langType="source" lang="de-de" />
            </file>
            <file id="00003" containsTranslatables="true" arch="java">
               <subpath>javalibs\de.ivu.mb.fpl.erh.jar</subpath>
               <language id="neutral" langType="source" lang="de-de" />
            </file>
            <file id="00008" containsTranslatables="true" arch="ISA">
               <subpath>dlg\fpl_afp.dlx</subpath>
               <language id="de-de" langType="source" lang="de-de" />
            </file>
            <file id="00009" containsTranslatables="false" arch="MFC">
               <subpath>dlg\fpl_afp.dll</subpath>
               <language id="de-de" langType="source" lang="de-de" />
            </file>
            ...
         </files>
     </fileInfo>
  </versionInfo>

For example, one of the things I want to do is retrieve some information from an individual /versionInfo/files/file node, on condition that its @arch value is either "java" or "mfc", and that its @containsTranslatables value is "true".

I need the following information:
1.  @arch attribute
2.  subpath element value
3.  language/@id and
4.  language/@lang

A search of file id="00003", for example, should yield a string array like this:
StringArray(0) -> "java"
StringArray(1) -> "javalibs\de.ivu.mb.fpl.erh.jar"
StringArray(2) ->"neutral"
StringArray(3) -> "de-de"

A search of file id="00009" should yield nothing.

Do I need four different XPath expressions*, each called separately from an XPath navigator, or can I do it more elegantly?

What is the best VB .NET class to use to implement the solution?  Should I use XPathNavigator?  And if so, what methods should I use?

Thanks very much in advance,

JaimeHy

*  Something like this?:  
"/versionInfo/files/file[@id=""" & fileID & """ and @containstranslatables=""true""
    and (@arch=""java"" or @arch="mfc")]/@arch", etc.