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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Mixed content in data-binding (Was: Re: Interestingpair of
On ven, 2005-07-15 at 08:24 +0100, Pete Cordell wrote:
> Original Message From: "Eric van der Vlist"
>
> > On jeu, 2005-07-14 at 11:54 -0400, Elliotte Harold wrote:
> >
> >> regardless, mixed content is not as uncommon or unexpected as many
> >> people think. It is not an accident. It is not bad form. It is not
> >> something to be avoided. It is the very natural way to express many
> >> extremely common constructs when modeling information, including
> >> so-called data-oriented applications (as if any information content were
> >> not data).
> >
> > Well said!
> >
> > Unfortunately, most people tend to exclude any mixed content from
> > data-oriented applications ...
>
> How do you think a data binding app should handle mixed content?
Some data binding applications do already support mixed content (IMO,
it's mostly a matter of defining that support as a requirement!).
Examples that come to mind are Amara
(http://uche.ogbuji.net/tech/4Suite/amara/) but also XMLBeans (see
http://www.rpbourret.com/xml/XMLDataBinding.htm)
Eric
> We lump a
> complex types mixed content into a string and stop there, which I don't
> think is ideal (although it is a common approach). Another approach could
> be to have strings in your language binding classes (in our case C++)
> interleaved with the data elements that would store the CDATA parts. Would
> this be better? Is there a need for both?
>
> The example that Elliotte gave earlier (<p>This is <strong>very</strong>
> important</p>) could possibly have been handled with an <xs:any
> namespace='xhtml'> construct. Do you have any other examples of mixed use
> in data-oriented applications that would not be treated as xhtml?
I give one in the chapter of my RNG book that I mentioned in my previous
mail (http://books.xmlschemata.org/relaxng/relax-CHP-7-SECT-10.html):
<price><currency>USD</currency>20</price>
<price>20<currency>Euro</currency></price>
I you were using an attribute to specify the currency, you would need to
find a way to specify if you want to display the currency before or
after the amount...
Of course, you can write:
<price>
<amount>20</amount>
<currency>USD</currency>
</price>
but you can also consider that wrapping the amount into an amount
element is not really needed.
Eric
--
Read me on Advogato.
http://advogato.org/person/vdv/
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Eric van der Vlist http://xmlfr.org http://dyomedea.com
(ISO) RELAX NG ISBN:0-596-00421-4 http://oreilly.com/catalog/relax
(W3C) XML Schema ISBN:0-596-00252-1 http://oreilly.com/catalog/xmlschema
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