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https://issues.apache.org/jira/browse/XERCESC-2198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17116854#comment-17116854
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Michael Glavassevich commented on XERCESC-2198:
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When we added support for XSD 1.1 to Xerces-J we thought it was risky enough 
that we introduced the support on a branch and produced a separate set of 
binaries for XSD 1.1. I think we're still doing dual maintenance because we're 
not completely confident that it wouldn't break existing users of XSD 1.0 and 
Xerces-J in general.

> Support xsd 1.1 in C++
> ----------------------
>
>                 Key: XERCESC-2198
>                 URL: https://issues.apache.org/jira/browse/XERCESC-2198
>             Project: Xerces-C++
>          Issue Type: Improvement
>          Components: Validating Parser (XML Schema)
>            Reporter: Nick Economidis
>            Priority: Major
>
> h3. The Request
> Please support xsd 1.1 in the C++ based Xerces.
> Around the web it has been suggested that you don't have plans to support it 
> because most uses are experimental. The following case is different:
> h3. Background
> The Association of Automobil Industry in Germany ([VDA|http://vda.de/], 
> Verband Der Automobil Industry) has recently developed an open standard file 
> format for describing welds and joints for widely used for automobile 
> manufacturers. The format is called xMCF ('extended master connection file'). 
> This format has been designed to share information across CAD, CAE and CAM 
> teams using a single file.
> During the past few years, I have been involved in the development of this 
> format. We have used xsd 1.1 to describe the schema. This is [the gitub 
> repository|https://github.com/economidis-nick/createXSDforxMCF/tree/master/V3.0r1]
>  where the standard has been developed.
> The standard is nearly complete, and most software vendors that build tools 
> for the automotive companies would like to use C++ library in order to test 
> the validity of a xml file.
> h3. Rationale
> So far we have used the *XercesJ* implementation to build a xMCF validator 
> for the test suite of the repository. But the software vendors would like a 
> C++ version of it so that they can incorporate the validator in their 
> software, which in this industry is typically C++.
> They do not want to depend on Java, because Java's future depends on the 
> company that owns/runs it.
>  



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