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Re: [xml-dev] Abandon the (mistaken) belief that XML attributes provide"metadata" and set yourself free to explore capability-based designs
- From: Michael Kay <mike@saxonica.com>
- To: "Costello, Roger L." <costello@mitre.org>, "xml-dev@lists.xml.org >> \"xml-dev@lists.xml.org\"" <xml-dev@lists.xml.org>
- Date: Sat, 19 Mar 2011 23:41:37 +0000
> Consider this XML snippet:
>
> <altitude units="feet">12000</altitude>
>
> I have heard it stated:
>
> The units attribute provides data about the
> element's data. That is, units provides
> metadata.
>
> However, the XML specification makes no such claim about attributes providing "metadata". This is what the XML specification says:
>
> Attributes are used to associate name-value pairs with elements.
>
> And then the specification goes on to describe the specific syntax for attributes.
>
> Thus, attributes don't provide data about an element's content. Attributes don't provide metadata.
That's a bit like arguing "The XML specification doesn't say that 12000
is an integer. Therefore 12000 is not an integer."
Michael Kay
Saxonica
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