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RE: DTD element type "ANY" vs. XML Schema element type "anyTyp

  • To: "Razvan MIHAIU" <mihaiu@m...>, <xml-dev@l...>
  • Subject: RE: DTD element type "ANY" vs. XML Schema element type "anyType"
  • From: "Chiusano Joseph" <chiusano_joseph@b...>
  • Date: Sun, 20 Feb 2005 12:10:07 -0500
  • Thread-index: AcUXadLTGVKnaR4DQsus/JS00WA6xQABLKMg
  • Thread-topic: DTD element type "ANY" vs. XML Schema element type "anyType"

dtd element
I see the spirit of XML Schema as being both control *and* flexibility -
the second also often being necessary in real-world implementations. Not
sure how many advanced XML users you believe are confused by this, and
who they may be.

However, perhaps the section on anyType in W3C Schema Primer Part 0[1]
might provide additional clarifications.

[1] http://www.w3.org/TR/2001/REC-xmlschema-0-20010502/#anyType

Kind Regards,
Joseph Chiusano
Booz Allen Hamilton
Strategy and Technology Consultants to the World
 

> -----Original Message-----
> From: Razvan MIHAIU [mailto:mihaiu@m...] 
> Sent: Sunday, February 20, 2005 11:29 AM
> To: xml-dev@l...
> Subject:  DTD element type "ANY" vs. XML Schema 
> element type "anyType"
> 
> 
> 
> 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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