Re: logicsheet updated

[Michael Wechner <mi...@wyona.org>]

Andreas Hartmann wrote:
> Christian Egli wrote:
> 
> [...]
> 
>> I think a logic sheet that simply invokes the page envelope input
>> module a couple of times would be fine with me.
> 
> 
> +1
> 
> IMHO logicsheets should only simplify XSP development and should
> contain as little "knowledge" as possible, because they are very
> difficult to maintain (no IDE support).

+1

> 
>>>> I'm against
>>>>
>>>> - accessing variables of the logicsheet from XSPs
>>>
>>>
>>> what's the problem with that? Transparency?
>>
>>
>> It defines no clear interface.
> 
> 
> - it relies on implicit contracts (e.g., variable initialization)
> - you don't see the variable type
> - changing it's value could break the logicsheet
> - variable name clashes may occur
> 
> IMHO, logicsheets should only define local variables within
> template blocks:
> 
> <xsl:template match="...">
>   {
>     int i = 0;
>   }
> </xsl:template>

makes sense to me

> 
>>>> - implicitely inserting XML fragments, Java code etc.
>>>
>>>
>>> AFAIK one cannot inherit XSPs, or am I wrong on this?
>>> What's the alternative?
>>
>>
>> I think the reason why Andreas doesn't want the logic sheet to insert
>> arbitrary Java code is to ensure that the stuff is handled where it
>> should be handled, i.e. in the Java code of the PageEnvelope,
>> Document, etc classes.
> 
> 
> Exactly (see above).
> With "implicitely" I mean that the tag name should show everything
> that is done by the tag, maybe it's better to call it "tags should
> have no side effects".

ok

Thanks

Michael

> 
> Andreas
> 
> 
> 
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-- 
Michael Wechner
Wyona Ltd.  -   Open Source Content Management   -   Apache Lenya
http://www.wyona.com              http://cocoon.apache.org/lenya/
michael.wechner@wyona.com                        michi@apache.org


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