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Re: [xsl] xsl:function vs. xsl:template

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> What are other benefits/shortcomings of either side? I haven't found
> any documentation on this issue but would appreciate any hints as to
> where to find some.

Benefits of using <xsl:function/>:

  1. Composability.

   2. Looks great in an expression which uses it as a parameter, as
return value or as a partial application.

   3. Readability (compactness) and maintainability.

   4. More loose coupling (does not depend on an  implicit context node)

   5. Can be referenced in an XPath expression

Shortcomings:

   1. Parameters are identified only by position (not by name)

    2. Can be impure (can have a side effect, such as creating new
node(s)) and just by looking at an expression referencing this
function people may not understand that it has a side effect. However
this possibility of confusion can be eliminated if proper naming is
used.

I tend always to use <xsl:function/>. In the cases when the function
creates new node(s) I follow the convention of starting its local-name
with the string "make", as in makePerson().


-- 
Cheers,
Dimitre Novatchev
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Truly great madness cannot be achieved without significant intelligence.
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To invent, you need a good imagination and a pile of junk
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Never fight an inanimate object
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You've achieved success in your field when you don't know whether what
you're doing is work or play



On Wed, Nov 19, 2008 at 4:38 AM, Felix Geller <fgeller@xxxxxxxxx> wrote:
> Hi all,
>
>   how does the experienced XSLT 2.0 programmer decide on whether to
> use a xsl:function or a (named) xsl:template? Are any performance
> issues involved (the processor I'm using is Saxon)?
>
> When trying to comprehend a stylesheet, I find it easier if the
> control-flow is managed by explicit function calls.
> Using functions imposes the additional "burden" of passing the node to
> work on, when compared to xsl:call-template. However, passing the node
> brings the benefit of making the "context" explicit.
> Being able to use a function in XPath expression also offers a less
> verbose invocation of functionality.
>
>
>
> cheers
>
> -- Felix

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