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Re: [xml-dev] DTD element type "ANY" vs. XML Schema element type"anyType"
- To: Razvan MIHAIU <mihaiu@...>
- Subject: Re: [xml-dev] DTD element type "ANY" vs. XML Schema element type"anyType"
- From: Bob Foster <bob@...>
- Date: Sun, 20 Feb 2005 09:44:06 -0800
- Cc: xml-dev@...
- In-reply-to: <E1D2txO-0000hC-Py@...>
- References: <E1D2txO-0000hC-Py@...>
- User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041217
People can be confused by almost anything. The author you quote is as
likely to be confused about DTD ANY as about XML Schema anyType.
Just because the anyType element content is unconstrained by the schema
doesn't mean it won't be further constrained by schemas for other
namespaces. In this regard, see the any and anyAttribute elements:
http://www.w3.org/TR/2001/REC-xmlschema-0-20010502/#any
As an aside, to argue that something should have been left out of XML
Schema because it is too confusing is like saying that the Bay of Fundy
should be left out of the Atlantic because it is too wet. ;-}
Bob Foster
Razvan MIHAIU wrote:
>
> Hi,
>
>
>
>
> I have noticed that the element type ANY from DTDs allows only elements
> that have been declared in the DTD while the element type "anyType" from
> XML Schema allows any kind of element inside it (even elements that were
> not declared inside the Schema).
>
> I have tested this behavior with XML Spy 2005 and xsv 2.8-1.
>
>
> Isn't this against the spirit of XML Schema (which is supposed to allow
> more control, not less) ? Why was this subtle difference allowed ? It
> seems to confuse even advanced XML users: in "Professional XML" (Wrox) I
> found the following phrase:
>
> "It is completely unconstrained and equivalent to the ANY keyword in
> DTDs, but in XML Schema it is known as the anyType."
>
>
>
>
>
> Regards,
> Razvan
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