RE: is there any formal commercial identity constraint cases

That’s a pity that there is no real application having identity constraints, maybe because that feature is quite advanced. Anyway, thanks for your info. The differences between identity constraint and other regular expressions are mostly listed below, which makes me concern the runtime overhead of identity constraint support in the real application usage. 

1.     Identity constraint processing creates dependence between validations in different SAX events, which make it hard for further advanced optimization; while regular expression in schema validation can be processed in a single SAX event validation.

2.     Identity constraint requires typed based comparison, which might involve a lot of table/value-object/memory management, type conversion and string operations during validation; while regular expression processing is relatively simple: accepted or not accepted.

 

Best Regards

Yongnian

________________________________

From: Michael Kay [mailto:mike@saxonica.com] 
Sent: 2007年5月11日 15:49
To: Le, Yongnian; xmlschema-dev@w3.org
Cc: Jones, Kevin; Yu, Zhiqiang
Subject: RE: is there any formal commercial identity constraint cases

 

Thanks for the explanation. I'm not aware of any public domain material that can be used for performance benchmarking of schema processors, whether it's concerned with identity constraints or anything else. Is there any particular reason why you think identity constraints should be a problem, as distinct from, say, validation of strings against complex regular expressions?

 

Michael Kay

http://www.saxonica.com/

	 

	
________________________________


	From: Le, Yongnian [mailto:yongnian.le@intel.com] 
	Sent: 11 May 2007 02:43
	To: Michael Kay; xmlschema-dev@w3.org
	Cc: Jones, Kevin; Yu, Zhiqiang
	Subject: RE: is there any formal commercial identity constraint cases

	I mean that whether there is any real customer case which contains identity constraint for us to use that as benchmark to measure performance of identity constraint support. Currently I only found there are hundreds of identity constraint unit cases in w3c XML Test Suite, but I am afraid that all of them are not representative enough in the real world used by customer. 

	 

	Best Regards

	Yongnian

	
________________________________


	From: Michael Kay [mailto:mike@saxonica.com] 
	Sent: 2007年5月10日 17:42
	To: Le, Yongnian; xmlschema-dev@w3.org
	Cc: Jones, Kevin; Yu, Zhiqiang
	Subject: RE: is there any formal commercial identity constraint cases

	 

	I'm not sure what you mean by "formal", "commercial", or "benchmarking".

	 

	Michael Kay

	http://www.saxonica.com/

		 

		
________________________________


		From: xmlschema-dev-request@w3.org [mailto:xmlschema-dev-request@w3.org] On Behalf Of Le, Yongnian
		Sent: 10 May 2007 09:52
		To: xmlschema-dev@w3.org
		Cc: Jones, Kevin; Yu, Zhiqiang
		Subject: is there any formal commercial identity constraint cases

		Hi everyone, 

		 

		Do you know whether there is any formal commercial identity constraint case available for benchmarking? Thanks a lot!

		 

		"I hear and I forget, I see and I remember, I do and I understand" -- quoted by Yongnian

		ICSC Compiler

		Le, Yongnian

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