Re: [xsl] Optimization using keys

[David Carlisle <davidc@xxxxxxxxx>]

> I'm afraid i don't understand what you're saying. Is it that if i want
> to use keys i can not use document()?

no but the usage is different and it would be a waste of time to explain
one use if you want another.

You only have one document so you can just delete all document() calls.

then a key is just a way of looking up certain nodes more quickly.

First tell the system to remember them, indexing on the Menu_K child:

<xsl:key name="m" match="Menu" use="Menu_K"/>

Then in any Xpath expression you can use
key('m',wibble)
which means the same as
//Menu[Menu_K=wibble]
except it is typically much faster as the system doesn't have to search
the whole document every time: it looks them up in some kind of internal
lookup table.

so

<xsl:apply-templates
select="document('')//Menu[Menu_K=current()/MenuData]/Filhos/Menu"
mode="copia"/>


becomes

<xsl:apply-templates
select="key('m',MenuData)/Filhos/Menu" mode="copia"/>

which is less to type and faster to execute.

David

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