Re: ancestor question

That worked perfectly and was a wonder explanation.  Thank
 you very very much.

Amy

Wendell Piez wrote:

> Amy,
>
> If I construe this correctly, you are falling into a subtle trap that often
> springs up to confound newer users.
>
> The trick is, that the value of a node-set is the string value of the
> *first* node in the node-set (in document order).
>
> So when your context node is an Aps:Drawing, and you ask for <xsl:value-of
> select="ancestor::Aps:VpmResultSet/Aps:PartStructure/Aps:Name"/>, the XPath
> traverses all the way up to the ancestor VpmResultSet (actually all of
> them, but you only have one), then down to collect all the Aps:Name
> children of its Aps:PartStructure children. It then has a bunch of nodes
> collected. But since you ask for the value, you get the value only of the
> first one. That's why the Name that comes out is always the same ("assembly
> 1").
>
> To identify correctly the Name that belongs to each Aps:Drawing, you need
> to traverse in a way that will avoid this pitfall. It looks from your data
> like going up just to ancestor::PartStructure (and no further), and then
> down, would work.
>
> As background, it may help you to know that the monster expression
>
> ancestor::Aps:VpmResultSet/Aps:PartStructure/Aps:Name
>
> is actually short for
>
> ancestor::Aps:VpmResultSet/child::Aps:PartStructure/child::Aps:Name
>
> (Seeing it explicit like this helps to dramatize how the steps work in the
> location path. Given the XPath, you get back *all* the Aps:Name children of
> *all* the Aps:PartStructure children of *all* the ancestor Aps:VpmResultSet
> nodes of your context node. This may be many Names. When you ask for the
> value, you get the value only of the first one.)
>
> Does that help?
> Regards,
> Wendell
>
> At 06:46 PM 9/27/01, you wrote:
> >Here's my XML:
> >
> ><?xml version="1.0"?>
> ><!DOCTYPE Aps:VpmResultSet SYSTEM
> >"http://sofa.atc.lmco.com/assist/config/dtd/ApsVpmQueryResponse.dtd">
> ><Aps:VpmResultSet xmlns:Aps="http://www.assist.com/">
> ><Aps:PartStructure>
> >   <Aps:Name>assembly 1</Aps:Name>
> >   <Aps:PartNumber>1</Aps:PartNumber>
> >   <Aps:TopAssemblyName>pre assembly</Aps:TopAssemblyName>
> >   <Aps:AsDesigned>
> >      <Aps:Drawing>
> >         <Aps:Name>drawing assembly 1-1</Aps:Name>
> >         <Aps:DocumentId>314-1</Aps:DocumentId>
> >         <Aps:Sheets>
> >            <Aps:LocatorUrl>http://www.yahoo.com</Aps:LocatorUrl>
> >         </Aps:Sheets>
> >      </Aps:Drawing>
> >     <Aps:Drawing>
> >         <Aps:Name>drawing assembly 1-2</Aps:Name>
> >         <Aps:DocumentId>314-2</Aps:DocumentId>
> >         <Aps:Sheets>
> >            <Aps:LocatorUrl>http://www.yahoo.com</Aps:LocatorUrl>
> >         </Aps:Sheets>
> >      </Aps:Drawing>
> >   </Aps:AsDesigned>
> ></Aps:PartStructure>
> ><Aps:PartStructure>
> >   <Aps:Name>assembly 2</Aps:Name>
> >   <Aps:PartNumber>2</Aps:PartNumber>
> >   <Aps:TopAssemblyName>pre assembly</Aps:TopAssemblyName>
> >   <Aps:AsDesigned>
> >      <Aps:Drawing>
> >         <Aps:Name>drawing assembly 2</Aps:Name>
> >         <Aps:DocumentId>315</Aps:DocumentId>
> >         <Aps:Sheets>
> >            <Aps:LocatorUrl>http://www.yahoo.com</Aps:LocatorUrl>
> >         </Aps:Sheets>
> >      </Aps:Drawing>
> >   </Aps:AsDesigned>
> ></Aps:PartStructure>
> ></Aps:VpmResultSet>
> >
> >Here's my XSL:
> >
> ><xsl:stylesheet version="1.0"
> >xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
> >    xmlns:Aps="http://www.assist.com/"
> >    xmlns:xalan="http://xml.apache.org/xalan"
> >    exclude-result-prefixes="Aps">
> >   <xsl:output method="html" indent="yes"/>
> >   <xsl:param name="Name" select="."/>
> >
> >   <xsl:template match="/">
> >     <xsl:for-each select="Aps:VpmResultSet/Aps:PartStructure">
> >       <xsl:for-each select="xalan:evaluate($Name)">
> >       <tr>
> >           <td><xsl:value-of
> >select="ancestor::Aps:VpmResultSet/Aps:PartStructure/Aps:Name"/></td>
> >          <td><xsl:value-of
> >select="ancestor::Aps:VpmResultSet/Aps:PartStructure/Aps:TopAssemblyName"/></td>
> >
> >           <td><xsl:value-of
> >select="ancestor::Aps:VpmResultSet/Aps:PartStructure/Aps:PartNumber"/></td>
> >
> >         <td><xsl:value-of select="Aps:DocumentId"/></td>
> >         <td><a><xsl:attribute name="href">
> >             <xsl:value-of select="Aps:Sheets/Aps:LocatorUrl"/>
> >             </xsl:attribute><xsl:value-of select="Aps:Name"/>
> >             </a>
> >         </td>
> >       </tr>
> >       </xsl:for-each>
> >     </xsl:for-each>
> >   </xsl:template>
> ></xsl:stylesheet>
> >
> >I'm getting (I've ignored the href part for now):
> ><tr>
> ><td>assembly 1</td>     <td>pre assembly</td>    <td>1</td>
> ><td>314-1</td>    <td>drawing assembly 1-1</td></tr>
> ><tr>
> ><td>assembly 1</td>     <td>pre assembly</td>    <td>1</td>
> ><td>314-2</td>    <td>drawing assembly 1-2</td> </tr>
> ><tr>
> ><td>assembly 1</td>     <td>pre assembly</td>    <td>1</td>
> ><td>315</td>    <td>drawing assembly 2</td></tr>
> >
> >but what I want is:
> ><tr>
> ><td>assembly 1</td>     <td>pre assembly</td>    <td>1</td>
> ><td>314</td>    <td>drawing assembly 1</td></tr>
> ><tr>
> ><td>assembly 1</td>     <td>pre assembly</td>    <td>1</td>
> ><td>314-2</td>    <td>drawing assembly 1-2</td> </tr>
> ><tr>
> ><td>assembly 2</td>     <td>pre assembly</td>    <td>2</td>
> ><td>315</td>    <td>drawing assembly 2</td></tr>
> >
> >The xalan:evaluate() is sent in from a setParameter("Name", param) and
> >seems to be working correctly.
> >In this case param would be Aps:AsDesigned/Aps:Drawing, however I've
> >just shown a section of the
> >true XML.  This param could be at different levels although the children
> >will look the same.
> >
> >The xalan:evaluate section seems to work, it's just that I also need the
> >ancestor information in the
> >table and that doesn't seem to be doing what I thought it would.
> >
> >Could someone please tell me why this doesn't work and how I should go
> >about fixing it?
>
> ======================================================================
> Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
> Mulberry Technologies, Inc.                http://www.mulberrytech.com
> 17 West Jefferson Street                    Direct Phone: 301/315-9635
> Suite 207                                          Phone: 301/315-9631
> Rockville, MD  20850                                 Fax: 301/315-8285
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