RE: Xerces-J 2.12.0 vs. Saxon: XSD 1.1 gYearMonth comparison is failing

Hi Mukul,

The expression in the assert is working in Saxon with flying colors.
The idea is to use the gYearMonth data type so it will check correctness of both year and month portions of it.

The real limitation is that the XSD 1.1 standard prevents use of the inheritable attributes in the asserts which is the opposite from what CTAs allow.
So it forces the assert to work just once in one-to-many fashion, i.e. <root> where @DataFeed attribute resides vs. multiple <r> with the Date elements in this case.

Please see the screenshots below.
They show that there is nothing wrong with the XPath expression.

[cid:[email protected]]

[cid:[email protected]]

Regards,
Yitzhak Khabinsky

From: Mukul Gandhi [mailto:[email protected]]
Sent: Thursday, August 9, 2018 1:18 AM
To: Yitzhak Khabinsky <[email protected]>
Cc: [email protected]
Subject: Re: Xerces-J 2.12.0 vs. Saxon: XSD 1.1 gYearMonth comparison is failing

Hi Yitzhak,

On Wed, Aug 8, 2018 at 8:41 PM, Yitzhak Khabinsky <[email protected]<mailto:[email protected]>> wrote:
            <xs:assert test="empty(r/Date[xs:gYearMonth(xs:date(.)) ne ../../xs:gYearMonth(@DataFeed)])"

I can't exactly debug your above XPath expression quickly. I'm sure, someone from Xerces team or community will offer advise about above XPath expression asap, in relation to XSD 1.1 <assert>.

In the meantime, I can offer following XPath 2.0 expressions as workaround for your usecase, which seem to work with Xerces.

empty(r/Date[substring(string(.),0,8) ne string(../../@DataFeed)<mailto:../../@DataFeed)>])

or

every $d in r/Date satisfies substring(string($d),0,8) eq string(@DataFeed)





--
Regards,
Mukul Gandhi


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