Re: [xsl] Handling dependency hierarchy in stylesheets

["Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Your function-available() idea is neat but it doesn't work. Firstly you missed
out the quotes

> use-when="not(function-available('my:common-base-included'))"

but more importantly, the static context for use-when does not include
stylesheet functions so this will always be false. This rule is to prevent
circularity: you can't know what stylesheet functions are available until you
have evaluated all the use-when attributes. In XSLT 3.0, however, configuring
it using a use-when attribute that refers to a static variable would work.

If you use import rather than include, then you don't get the errors due to
components being declared more than once, but you do get other problems: you
end up with template rules present with more than one import precedence which
plays havoc with xsl:next-match (quite apart from being a nightmare for the
processor to implement efficiently).

One approach (if you're not going to use import precedences and next-match) is
to declare none of the dependencies in the module itself, but instead, for
each configuration of modules that you actually want to use in combination
with each other, maintain a top-level module that does nothing other than
xsl:include everything required.

I would hope you can look again at packages. Yes, the configuration issues
complicate matters - but no more so than the use of catalogs which are widely
used with complex include/import structures.

Michael Kay
Saxonica


> On 11 Feb 2018, at 09:16, Dr. Patrik Stellmann patrik.stellmann@xxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hi,
>
> I have multiple small utility xslt files that I use in several other
stylesheets with xsl:include b which works fine when there is a very flat
hierarchy. But I found no comfortable way with a scenario like this:
>
> -       common-base.xsl has no dependencies.
> -       common-1.xsl and common2.xsl both require common-base.xsl
> -       main.xsl requires common1.xsl and common-2.xsl
>
> So I have to include common-1 and common-2 in main. But how do I deal with
common-base?
> I would like to include common-base in common-1 and common-2 b because
this is where the dependency actually is. But then this file is included twice
in main!?
>
> Currently I kind of solved this by not including common-base in common-1 and
common-2 but directly in main. But this way I always to have include
common-base as  well as when using common-1 or common-2. And in reality there
are much more dependencies so this is very annoying.
>
> Using packages also seems to be no option for me since b as far as I
understood it b their need to be registered and I donbt always have easy
access to the configuration.
>
> Another approach was to do something like the common #ifndef from C/C++
headers by using the @use-when on the root xsl:stylesheet:
> use-when="not(function-available(my:common-base-included))"
> But I get an error bXPDY0002: Error in use-when expression. The context
item is absentb. So I guess I cannot use this on the root element.
>
> This issue seems to be very common so Ibd expect there to be a good
solution but I couldnbt find itb&
>
> Any suggestions?
>
> Thanks and regards,
> Patrik
>
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