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From "Conal Tuohy" <Conal.Tu...@vuw.ac.nz>
Subject RE: Initializing variables in XSLT
Date Fri, 13 May 2005 02:47:37 GMT
Oleg Konovalov wrote:

> I am new to XSLT, trying to significantly modify somebody else's XSL.

You should ask these XSLT questions on the Mulberry XSL list. If you are
new to XSL you'll find it invaluable.

> I need to create min and max variables
> to be used in many templates and sub-templates based on 
> certain conditions (not always).

See the Functional XSL project:
http://fxsl.sourceforge.net/articles/FuncProg/2.html#minimum

> What I don't know is:
> 1) how to make template to return a value, something like:
>   min = <call-template name="calculate-min"/>

<xsl:variable name="min"><xsl:call-template
name="calculate-min"/></xsl:variable>

> 2) how to declare variable and then assign it much later in the code;

You have to declare and assign in the same place. Variables in XSLT are
not really "variable" :-)
They are like static final variables in Java.

> 3) Also, it there a way to compare a value and a previous 
> value within a for-each loop like:
> <xsl:for-each mystruct/myvar1>
>   <xsl:if test="position() &gt; 1  and
>     var2 &gt; var2(position()-1)">...do something...
>   </xsl:if>
> </xsl:for-each>
> Would that work ?

If "...do something" is supposed to re-assign the value of the "min"
variable, then no, you can't work this way, because you can't modify the
value of a variable. You can do something like this by recursing,
though, so you have multiple instances of a variable on a stack (hence
you're not changing it's value, just hiding it by introducing a new
variable binding in a more local scope).

> 4) Can I get access to a value from another branch from 
> within for-each ?
> Like:
> <xsl:for-each mystruct/myvar1>
>   <xsl:if test="var2 &gt; ../var3">...do something...
>   </xsl:if>
> </xsl:for-each>) 

I'm not entirely clear on what you mean. I think so.

Anyway ... try the Mulberry XSL list, it's much better for pure XSL
questions.

Regards

Con

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