Re: [xsl] extracting all elem names of an attribute

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2004-01-23 02:04 -0500, Saverio Perugini wrote:
> How best is the following text extracted
> from the following xml, possibly using keys
> or some other xslt constructs?
> ...
> The basic approach involves:

Gee, that sounds like a good approach to me:

>    - using keys to get a unique list of possible values for the @category 
> attribute

<xsl:key name="cats" match="*[@category]" use="@category"/>

>    - iterating over these values

  <xsl:for-each select="//*[@category]
                       [generate-id(.)=generate-id(key('cats',@category)[1])]">

>         - printing each followed by a colon

    <xsl:value-of select="@category"/>: <xsl:text/>

>         - getting a unique list of all xml element names which contain 
> this particular attribute value
>              - iterating over these values

    <xsl:for-each select="key('cats',@category)">
      <xsl:if test="generate-id(.)=
               generate-id(key('cats',@category)[name(.)=name(current())][1])">

>                   printing each

        <xsl:value-of select="name(.)"/>

>                   printing an endline

      <xsl:text>
</xsl:text>

> Many thanks

For what?  You already understand the solution!  :{)}

...................... Ken

p.s. you have a typo in your XML data, unless you like peepers on your pizza

t:\ftemp>type saverio.xml
<db>
   <large category="size">
      <thin category="crust">
         <olives category="topping"/>
         <pepperoni category="topping"/>
      </thin>
      <pan category="crust">
         <pepperoni category="topping"/>
      </pan>
   </large>
   <medium category="size">
      <pan category="crust">
         <pepperoni category="topping"/>
         <olives category="topping"/>
         <peppers category="topping"/>
      </pan>
   </medium>
   <small category="size">
      <thin category="crust">
         <olives category="topping"/>
         <pepperoni category="topping"/>
         <peepers category="topping"/>
      </thin>
      <pan category="crust">
         <pepperoni category="topping"/>
         <olives category="topping"/>
         <peepers category="topping"/>
      </pan>
   </small>
</db>

t:\ftemp>type saverio.xsl
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">

<xsl:output method="text"/>

<xsl:key name="cats" match="*[@category]" use="@category"/>

<xsl:template match="/">
  <xsl:for-each select="//*[@category]
                       [generate-id(.)=generate-id(key('cats',@category)[1])]">
    <xsl:value-of select="@category"/>: <xsl:text/>
    <xsl:for-each select="key('cats',@category)">
      <xsl:if test="generate-id(.)=
               generate-id(key('cats',@category)[name(.)=name(current())][1])">
        <xsl:if test="generate-id(.)!=
                      generate-id(key('cats',@category)[1])">, </xsl:if>
        <xsl:value-of select="name(.)"/>
      </xsl:if>
    </xsl:for-each>
      <xsl:text>
</xsl:text>
  </xsl:for-each>
</xsl:template>

</xsl:stylesheet>

t:\ftemp>saxon saverio.xml saverio.xsl
size: large, medium, small
crust: thin, pan
topping: olives, pepperoni, peppers, peepers

t:\ftemp>


--
Public courses: sign up for one or both soon to reserve your seat!
Each week:  Monday-Wednesday: XSLT/XPath;  Thursday-Friday: XSL-FO
Washington, DC: 2004-03-15           San Francisco, CA: 2004-03-22
Hong Kong, China: 2004-05-17           Bremen, Germany: 2004-05-24
World-wide on-site corporate, government & user group XML training

G. Ken Holman                 mailto:gkholman@xxxxxxxxxxxxxxxxxxxx
Crane Softwrights Ltd.          http://www.CraneSoftwrights.com/s/
Box 266, Kars, Ontario CANADA K0A-2E0    +1(613)489-0999 (F:-0995)
Male Breast Cancer Awareness  http://www.CraneSoftwrights.com/s/bc


XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list