In the xsl-list, to which you cross-posted this identical message there 
already were good replies -- just read about the "identity rule" in XSLT. 
This is definitely the most important XSLT design pattern.

Cheers,
Dimitre Novatchev


"Martin Honnen" <mahotrash@y...> wrote in message 
news:uUHEW$bDJHA.3392@T......
> bigAPE wrote:
>> Hi All,
>>
>> I'm trying to clone a nodeset and alter one or two of the element
>> values in an attempt to save me having to rebuild all of them or copy
>> them all over and add the new ones.
>>
>> So What I would like to do is "Copy" SomeBlock named "A" with all the
>> 50+ child elements intact, but modify one or more random fields with
>> updated values
>>
>> -----------------------------
>> SAMPLE INPUT
>> -----------------------------
>>
>> <wrapper>
>>     <SomeBlock name="A">
>>         <SomeField name="A1">SomeValue1</SomeField>
>>         <SomeField name="A2">SomeValue2</SomeField>
>>         <SomeField name="A3">SomeValueA</SomeField>
>>         <SomeField name="A4">SomeValueB</SomeField>
>>         ...and about 50 more elements
>>     </SomeBlock>
>>     <SomeBlock name="B">
>>         <SomeField name="A1">SomeValue2</SomeField>
>>         <SomeField name="A2">SomeValue1</SomeField>
>>         <SomeField name="A3">SomeValueF</SomeField>
>>         <SomeField name="A4">SomeValueE</SomeField>
>>         ...and about 50 more elements
>>     </SomeBlock>
>>     <SomeBlock name="C">
>>         <SomeField name="A1">SomeValue2</SomeField>
>>         <SomeField name="A2">SomeValue1</SomeField>
>>         <SomeField name="A3">SomeValueF</SomeField>
>>         <SomeField name="A4">SomeValueE</SomeField>
>>         ...and about 50 more elements
>>     </SomeBlock>
>>     ...more SomeBlocks
>>     <actions>
>>         <action type="Update" ref="A">
>>             <field name="A2">SomeValue9</Field>
>>             <field name="A4">SomeValueX</Field>
>>         </action>
>>         <action type="Update" ref="C">
>>             <field name="A1">SomeValue5</Field>
>>         </action>
>>     </actions>
>> </wrapper>
>>
>> -----------------------------
>> SAMPLE OUTPUT
>> -----------------------------
>> The output of the XSLT would be as follows:
>>
>> <Results>
>>     <SomeBlock name="A">
>>         <SomeField name="A1">SomeValue1</SomeField>
>>         <SomeField name="A2">SomeValue9</SomeField>  <-- Updated
>>         <SomeField name="A3">SomeValueA</SomeField>
>>         <SomeField name="A4">SomeValueX</SomeField>  <-- Updated
>>         ...and about 50 more elements
>>     </SomeBlock>
>>     <SomeBlock name="C">
>>         <SomeField name="A1">SomeValue5</SomeField>  <-- Updated
>>         <SomeField name="A2">SomeValue1</SomeField>
>>         <SomeField name="A3">SomeValueF</SomeField>
>>         <SomeField name="A4">SomeValueE</SomeField>
>>         ...and about 50 more elements
>>     </SomeBlock>
>> </Results>
>
> Here is an XSLT stylesheet:
>
> <xsl:stylesheet
>   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>   version="1.0">
>
>   <xsl:output method="xml" indent="yes"/>
>   <xsl:strip-space elements="*"/>
>
>   <xsl:template match="@* | node()">
>     <xsl:copy>
>       <xsl:apply-templates select="@* | node()"/>
>     </xsl:copy>
>   </xsl:template>
>
>   <xsl:template match="/wrapper">
>     <Results>
>       <xsl:apply-templates select="SomeBlock[@name = 
> /wrapper/actions/action[@type = 'Update']/@ref]"/>
>     </Results>
>   </xsl:template>
>
>   <xsl:template match="SomeField">
>     <xsl:copy>
>       <xsl:apply-templates select="@*"/>
>       <xsl:variable name="fieldaction"
>         select="/wrapper/actions/action[@type = 'Update' and @ref = 
> current()/parent::SomeBlock/@name]/field[@name = current()/@name]"/>
>       <xsl:choose>
>         <xsl:when test="$fieldaction">
>           <xsl:value-of select="$fieldaction"/>
>         </xsl:when>
>         <xsl:otherwise>
>           <xsl:value-of select="."/>
>         </xsl:otherwise>
>       </xsl:choose>
>     </xsl:copy>
>   </xsl:template>
> </xsl:stylesheet>
>
>
> -- 
>
> Martin Honnen --- MVP XML
> http://JavaScript.FAQTs.com/