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Old December 9th, 2010, 06:18 PM
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Default proper use of xsl:key?

Suppose I have the following collection of "word" elements:

Code:
<word>
<id>1</id>
<text>My</text>
</word>
<word>
<id>2</id>
<text>name</text>
</word>
<word>
<id>3</id>
<text>is</text>
</word>
<word>
<id>4</id>
<text>Joe</text>
</word>
Given an integer ID value, in order to find the corresponding TEXT, I can do this:

Code:
<xsl:key name="word-by-id" match="word" use="id"/>
return key('word-by-id', string($ID))/text
But what if word are instead specified as

Code:
<word id=1>
<text>My</text>
</word>
How do I need to change the "xsl:key" in order to retrieve TEXT using ID?

Thanks
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Old December 9th, 2010, 06:48 PM
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Simply change it to use="@id"
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Old December 10th, 2010, 11:48 AM
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Quote:
Originally Posted by samjudson View Post
Simply change it to use="@id"
Sam, thanks. One more change -- an error on my part. The word section is actually encapsulated by a "words" element, i.e.

Code:
<words>
   <word id=1>
   ...
   </word>
   ...
</words>
Does this change the key statement or the for statement. Currently when I run the transform I get empty output as if it can't find any matches.

Thanks!
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Old December 10th, 2010, 12:03 PM
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No, the above should work just fine without any changes to the key function.

If you are not getting anything returned then the error must be in something else youhaven't shown us.
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Old December 10th, 2010, 12:22 PM
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Quote:
Originally Posted by samjudson View Post
No, the above should work just fine without any changes to the key function.

If you are not getting anything returned then the error must be in something else youhaven't shown us.
OK, let me give you the complete source XML. What I called words before are actually called tokens and sentences are now namedEntities but the idea is still the same.

1. Here's the source XML:
Code:
<?xml version="1.0" encoding="UTF-8"?>

<rexml:document xmlns:rexml='http://www.basistech.com/2003/rexml'>
<header>
  <language>en</language>
<original-encoding>UTF-16</original-encoding>
</header>
<contents>
<tokens>
  <token index='104'>
    <word>WORD_SKIP1</word>
    <position start='572' end='581' />
    <pos>ADJ</pos>
  </token>
  <token index='105'>
    <word>WORD_SKIP2</word>
    <position start='582' end='584' />
    <pos>PREP</pos>
  </token>
  <token index='106'>
    <word>WORD_USE11</word>
    <position start='585' end='591' />
    <pos>NOUN_PROP</pos>
  </token>
  <token index='107'>
    <word>WORD_USE12</word>
    <position start='591' end='592' />
    <pos>PUNC</pos>
  </token>
  <token index='112'>
    <word>WORD_SKIP3</word>
    <position start='604' end='605' />
    <pos>PUNC</pos>
  </token>
  <token index='113'>
    <word>WORD_USE21</word>
    <position start='605' end='610' />
    <pos>NOUN_PROP</pos>
  </token>
  <token index='114'>
    <word>WORD_USE22</word>
    <position start='610' end='611' />
    <pos>PUNC</pos>
  </token>
 </tokens>
<namedEntities>
  <namedEntity>
    <entityStart>106</entityStart>
    <entityEnd>107</entityEnd>
    <entityType>LOCATION</entityType>
  </namedEntity>
  <namedEntity>
    <entityStart>113</entityStart>
    <entityEnd>114</entityEnd>
    <entityType>ORGANIZATION</entityType>
  </namedEntity>
</namedEntities>
</contents>
</rexml:document>
2. Here's my XSLT:
Code:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>

<xsl:key name="entity-by-token-index" match="token" use="@index"/>

<xsl:strip-space elements="*"/>

<xsl:template match="/">
	<data>
    <xsl:for-each select="//namedEntities/namedEntity">
		<container>
			<xsl:value-of select="for $index in entityStart to entityEnd-1 
													return key('entity-by-token-index', string($index))/word"/>
		</container>
  </xsl:for-each>
  </data>
</xsl:template>

</xsl:stylesheet>
3. Here's the resulting XML:
Code:
<?xml version="1.0" encoding="UTF-8"?>
<data>
   <container/>
   <container/>
</data>
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Old December 10th, 2010, 12:39 PM
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"entityEnd-1" is not an arithmetic expression as you seem to want, rather it selects nodes with the name "entityEnd-1". If you want to substract 1 use a space e.g. "entityEnd - 1" but for the "to" expression you will need
Code:
for $index in entityStart to xs:integer(entityEnd) - 1
to ensure you have integer values. And then you need to put
Code:
xmlns:xs="http://www.w3.org/2001/XMLSchema"
on the xsl: stylesheet element (and probably want exclude-result-prefixes="xs" too).
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