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From: Georg Bauhaus <bauhaus@futureapps.invalid>
Newsgroups: comp.lang.ada
Subject: Re: What is the best license to use for open source software?
Date: Thu, 29 Jan 2015 10:29:49 +0000 (UTC)
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Date: 2015-01-29T10:29:49+00:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote:
> On Wed, 28 Jan 2015 23:03:24 -0800 (PST), Vadim Godunko wrote:
> 
>> On Tuesday, January 27, 2015 at 11:52:28 AM UTC+3, Dmitry A. Kazakov wrote:
>>> 
>>> One basic issue more, should the template paradigm be:
>>> 
>>> A. Substitution-based (some escape sequences in the text);
>>> B. Language-based;
>>> C. Programmable (some API to manipulate the template, plus intermediate
>>> embeddable code, plus GUI editor).
>>> 
>> Matreshka includes templates engine that uses XML format for templates and
>> handles substitutions and conditional processing. Generated output can be
>> XML or optimized HTML (when template uses HTML namespace). See
>> 
>> http://forge.ada-ru.org/matreshka/wiki/XML/Templates
>> 
>> Source template not necessary should be file: it can be any stream of
>> stream elements or sequence of 'markup events' - elements of internal
>> representation of XML document.
> 
> That would be A, while I prefer C. E.g. instead of XML:
> 
>    <mtl:if expression="boolean_expression">
>      ...
>    </mtl:if>
> 
> Ada's:
> 
>    ... & (if Condition then ... else Null_Text end if) & ...

No professional designer will accept
Anything like it.


> I would also try to declare HTML elements as typed constants. 

This can be done in programs modelling
HTML documents, but for working with
templates, XML-defined validity and
sometimes even just wellformedness
turns out to be quite enough.

The idea is
> to ensure the resulted HTML page being correct (e.g. matched elements <b>
> </b>) for any set of actual parameters. One flaw of the approaches A and B
> is that there is no way to do this.

XML not matching elements? I must
be misunderstanding something.