Re: [xsl] Testing by counting or positional predicate

[Francis Norton <francis@xxxxxxxxxxx>]

Daniel Bowen wrote:
> 
> Just for an opposing view point on this, on one stylesheet that I use
> Muenchian grouping, I have a filter on the key "match".  When I use the
> "count" method, I have to use the filter again when selecting the nodes, but
> when I use the "generate-id" method, I don't have to use the filter again.
> In my case, the "generate-id" method is 2-3 times faster!
> 
> Example:
> 
>   <xsl:key
>     name="key-texture"
>     match="Texture[0=count(preceding-sibling::Texture[1])]"
>     use="concat(@texture, ':', @u, ':', @v)" />
>   <xsl:variable
>     name="primary-textures"
>     select="//Texture[generate-id(.) = generate-id(key('key-texture',
> concat(@texture, ':', @u, ':', @v))[1])]" />
> 
> is faster for me than:
> 
>   <xsl:key
>     name="key-texture"
>     match="Texture[0=count(preceding-sibling::Texture[1])]"
>     use="concat(@texture, ':', @u, ':', @v)" />
>   <xsl:variable
>     name="primary-textures"
> 
> select="//Texture[0=count(preceding-sibling::Texture[1])][count(.|key('key-t
> exture', concat(@texture, ':', @u, ':', @v))[1])]" />
> 

Did you try

<xsl:variable
  name="primary-textures"
  select="//Texture[count(. | (key('key-texture', concat(@texture, ':',
@u, ':', @v))[1]) = 1]"
  />

which seems to me to be the equivalent to your generate-id()version?

Francis.

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