Flaw? - <?xml-model?> and multiple namespaces

[Carla Huls]

Hi,

I have two RelaxNG schemas called Address.rng and Customers.rng, with target namespaces "http://www.myserver.com/xmlns/address" and "http://www.myserver.com/xmlns/customers".

Schema Customers.rng has an <anyName> instruction, like this:

Code: Select all

    <element name="CustomerInformation">

        <anyName>

            <except>

				<nsName ns="blah"/>

			</except>

		</anyName>

	</element>

This means i can put elements from any namespace except "blah" within element "CustomerInformation", like this:

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	<cust:CustomerInformation xmlns:cust="http://www.myserver.com/xmlns/customers">

		<addr:Address xmlns:addr="http://www.myserver.com/xmlns/address">

		</addr:Address>

	</cust:CustomerInformation>

To validate this document i use an xml-model instruction:

<?xml-model href="Customers.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>

But, this doesn't work, because namespace "http://www.myserver.com/xmlns/address" is not defined. So, i add a second xml-model instruction:

<?xml-model href="Address.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>

But, this also doesn't work, because these xml-model instructions are used one-by-one, not together.


Any ideas?

Thank you,
- Carla


Full Example:

Address.rng:

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<?xml version="1.0" encoding="utf-8"?>

<grammar

	datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"

	ns="http://www.myserver.com/xmlns/address"

	xmlns="http://relaxng.org/ns/structure/1.0"

	xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0">

	<start>

		<ref name="start"/>

	</start>

	<define name="start">

		<element name="Address">

			<element name="Street">

				<data type="string"/>

			</element>

			<element name="City">

				<data type="string"/>

			</element>

			<element name="State">

				<data type="string"/>

			</element>

			<element name="ZipCode">

				<data type="string"/>

			</element>

		</element>

	</define>

</grammar>

Customers:

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<?xml version="1.0" encoding="utf-8"?>

<grammar

	datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"

	ns="http://www.myserver.com/xmlns/customers"

	xmlns="http://relaxng.org/ns/structure/1.0"

	xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0">

	<start>

		<ref name="start"/>

	</start>

	<define name="start">

		<element name="Customers">

			<element name="CustomerInformation">

				<element name="CustomerNumber">

					<data type="integer"/>

				</element>

				<element name="blabla">

					<data type="integer"/>

				</element>

				<element>

					<anyName>

						<except>

							<nsName ns="blah"/>

						</except>

					</anyName>

					<text/>

				</element>

			</element>

		</element>

	</define>

</grammar>

Example.xml:

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<?xml version="1.0" encoding="utf-8"?>

<?xml-model href="Address.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>

<?xml-model href="Customers.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>

<cust:Customers

	xmlns:addr="http://www.myserver.com/xmlns/address"

	xmlns:cust="http://www.myserver.com/xmlns/customers">

	<cust:CustomerInformation>

		<cust:CustomerNumber error1="">990023</cust:CustomerNumber>

		<addr:Address>

			<addr:Street>9902 Broadway</addr:Street>

			<addr:City>Chicago</addr:City>

			<addr:error2/>

			<addr:State>IL</addr:State>

			<addr:ZipCode error3="">60612</addr:ZipCode>

		</addr:Address>

	</cust:CustomerInformation>

</cust:Customers>

[adrian]

Hi,

xml-model instructions are meant to associate one or more schemas with the XML document. They are not supposed to be complementary within the same schema model, they are supposed to provide multiple validation steps. This means each xml-model specified schema will be evaluated independently from the others.
http://www.w3.org/TR/xml-model/#the-xml ... nstruction

BTW, is there any reason why you don't refer Address.rng in the Customers.rng schema?
Instead of:

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                <element>

                    <anyName>

                        <except>

                            <nsName ns="blah"/>

                        </except>

                    </anyName>

                    <text/>

                </element>

You can use:

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<externalRef href="Address.rng"/>

In the XML you'll only need the Customers.rng xml-model instruction.

Regards,
Adrian

[Carla Huls]

Thank you for your response.

My question was not of a practical nature. I find it strange that it's not possible to decide in the XML document which namespaces to combine when using the xml-model instruction. In XMLSchema I can do this:

<?xml version="1.0" encoding="utf-8"?>
<cust:Customers
xmlns:addr="http://www.myserver.com/xmlns/address"
xmlns:cust="http://www.myserver.com/xmlns/customers"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.myserver.com/xmlns/address Address.xsd
http://www.myserver.com/xmlns/customers Customiers.xsd">
<cust:CustomerInformation>
<cust:CustomerNumber error1="">990023</cust:CustomerNumber>
<addr:Address>
<addr:Street>9902 Broadway</addr:Street>
<addr:City>Chicago</addr:City>
....

When this XML Document is validated, both namespaces (address & customers) are checked.
There is no alternative using xml-model:

<?xml version="1.0" encoding="utf-8"?>
<?xml-model href="Address.rng" type="application/xml" schematypens="http://www.w3.org/2001/XMLSchema"?>
<?xml-model href="Customers.rng" type="application/xml" schematypens="http://www.w3.org/2001/XMLSchema"?>
<cust:Customers
xmlns:addr="http://www.myserver.com/xmlns/address"
xmlns:cust="http://www.myserver.com/xmlns/customers">
<cust:CustomerInformation>
<cust:CustomerNumber error1="">990023</cust:CustomerNumber>
<addr:Address>
<addr:Street>9902 Broadway</addr:Street>
<addr:City>Chicago</addr:City>
....

This is not the same as the previous example: here the XML document is validated twice against both namespaces, one by one.