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Re: [xml-dev] RELAX NG equivalent of <xsd:any processContents="lax">?

Hi Noah,

It is not necessary to modify the existing official XML Schema provided for SOAP by W3C. I think the purpose of the example in the tutorial was to emphasize on the necessity to avoid ambiguity when using <anyName>, not to show the one and only way of doing things.

For example, it is possible to write a RELAX NG schema that would validate interesting elements (such as purchaseOrder in your example) within whatever container vocabulary(soap in your example), except the vocabulary of the interesting elements; the interesting elements can be defined in this schema or another one:

<?xml version="1.0"?>
<grammar xmlns="http://relaxng.org/ns/structure/1.0">
        <ref name="rootElement"></ref>
    <define name="rootElement">
                    <nsName ns="http://interestingElements.com"></nsName>
            <ref name="children"></ref>
    <define name="children">   
                        <nsName ns="http://interestingElements.com"></nsName>
                <ref name="children"></ref>
            <ref name="interestingElements"></ref>
    <define name="interestingElements">
            <externalRef href=""interestingElement1.rng"/>             <externalRef href=""interestingElement2.rng"/>        </choice>       

The document can be validated against the official SOAP schema for the container structure and against the other schema for the content. If one of the validations fails, the document is not valid.


Radu Cernuta

2007/2/6, noah_mendelsohn@us.ibm.com <noah_mendelsohn@us.ibm.com>:
I'm not a RELAX NG expert, but I am interested in this question, so maybe
your or other experts can provide a bit more detail.  What I see at
http://relaxng.org/tutorial-20011203.html#IDAFLZR gives some of what I
think people look for in W3C Schema lax validation, but not quite all of
it.  The difference I think I see is in the case where the attribute that
does have a declaration (xml:space in the example at the link) gets its
declaration from a separate schema document (in W3C Schema terms), perhaps
for a different targetNamespace.  The RELAX NG solution shown seems to
require that a list of the elements to be validated be provided with the
<anyName> wildcard in an <except> element.

Consider a SOAP envelope:


There are a variety of ways to acheive different effects using W3C XML
Schema, but the schema that's officially published by W3C for the envelope
has the body marked <any processContents="lax"/>. If someone comes along
and writes a completely separate schema document describing the
po:purchaseOrder, and passes both schema documents in on the API call to
the validator, the envelope and the purchaseOrder will be validated
together, and the overall envelope will be marked invalid if either the
envelope markup or the purchaseOrder is in error.  As I understand the
solution proposed above, it would involve modifying the W3C-provided
envelope schema to list <po:purchaseOrder> in an <except>.

Does RELAX NG have another approach, or is this considered a non-goal?
Certainly one always has the option of validating the container and the
payload separately.   Thanks!


Noah Mendelsohn
IBM Corporation
One Rogers Street
Cambridge, MA 02142

"Radu Cernuta" <radu.cernuta@gmail.com>
02/06/2007 06:49 AM

        To:     "Jeff Lowery" <jlowery@myrio.com>
        cc:     xml-dev@lists.xml.org, (bcc: Noah
        Subject:        Re: [xml-dev] RELAX NG equivalent of <xsd:any

For lax validation in RELAX NG you could take a look at the RELAX NG
Tutorial by James Clark and Murata Makoto. Section 11 (Name Classes)
handles this issue.



Radu Cernuta

2007/2/6, Jeff Lowery <jlowery@myrio.com>:
This has got to be a FAQ, but no luck with googling:

Trying to find a shorthand method to validate content using lax
constraints in RELAX NG.  I want something like this:

namespace foo = "http://www.w3.org/foo"

qux =
    element baz {empty}     # some element

bar =
    element bar { anyLax* }  #allow baz, bar, anyOtherElement

anyOtherElement =
  element * - foo:*  {        # any elements not in this namespace
    attribute * { text }*,
     | anyOtherElement)*

anyLax = (
        grammar {*}             #all patterns


Don't work, though.

Only examples I've seen enumerate all the grammars by name in the
schema. Doesn't appear there is wildcard of that type.


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