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Subject: RE: [xliff-comment] Schema issues with extensible attributes

Asgeir, XLIFF TC,

Thanks for pointing out these issues.

Attached are the modified schemas and Sample_AlmostEverything* files. Note
that the files are appended with today's date so that they do not
accidentally overwrite the official copies. Just rename them to remove the
date from the file name.

Asgeir, please test them using your validator(s).

Here's a summary of the changes:

1. Sample_AlmostEverything_1.2_transitional.xlf

1.1 Fixed the file name of the schema by removing the date as pointed out by

2. Sample_AlmostEverything_1.2_strict.xlf

2.1 Fixed the file name of the schema by removing the date as pointed out by

2.2 Remove deprecated attributes.

3. xliff-core-1.2-transitional.xsd

3.1 processContents="skip" (was "lax") 

The value "lax" is the correct value except that two of the validators (.NET
XML Parser and XSV 2.10-1) complain that they cannot read the schema. In
short, they treat "lax" the same as "strict". Although I consider these bugs
in the parsers, it seems better to use "skip" so that all the parsers I have
(see list below) succeed. Besides, the validation is slightly faster because
it does not need to check for a schema. The only downside is that if a
schema is available for the 'other' namespace, it will be ignored.

3.2 Removed occurrence from xsd:sequence for 'tool' element.

<xsd:element name="tool">
	<xsd:complexType mixed="true">
		<xsd:sequence maxOccurs="unbounded" minOccurs="0">
			<xsd:any maxOccurs="unbounded" minOccurs="0" ...
is now 

<xsd:element name="tool">
	<xsd:complexType mixed="true">
			<xsd:any maxOccurs="unbounded" minOccurs="0" ...

Only one of the validators (Xerces or XSV) complained about the (potential)

4. xliff-core-1.2-strict.xsd

Same changes as in transitional, plus:

4.1 Removed deprecated attributes. They previously were declared with

The use="prohibited" attribute is a bit confusing. As it turns out, the
standard states that use="prohibited" is only useful when a definition
inherits from a base definition, such as when adding a restriction. In this
situation, the use="prohibited" may be used to make an optional attribute in
the base definition invalid. In other words, as if it was not defined. It is
not to be used to explicitly prohibit attributes in a type that allows
xsd:anyAttribute. Oh, well. The validators, however, are not consistent. The
Stylus Studio 2006 and MSXML 4.0 parsers interpret use="prohibit" to mean
the attribute is invalid. The newer parsers follow the standard and complain
if use="prohibit" is used when there is no base definition. OK, so to comply
with the standard and newer parsers, we can't define deprecated attributes
with use="prohibited", we must simply not define them and hope the parser
will treat them as invalid. 

4.2 Changed namespace from ##any to ##other to invalidate deprecated

<xsd:anyAttribute namespace="##any"


<xsd:anyAttribute namespace="##other"

The other half of this change is the namespace for anyAttribute. As Tony
pointed out, the TC chose '##any' to support backward and forward
compatibility. However, W3C XML Schema does not provide a way to override
anyAttribute and explicitly prohibit deprecated attributes, so the namespace
'##other' is needed, as Rodolfo suggested. Since this is only for the
'strict' edition of the XLIFF schema, it should be acceptable.

List of validators I have:

Stylus Studio 2006 built-in
MSXML 4.0 DOM Parser
MSXML 6.0 DOM Parser
Saxonica 8.7 Validator
.NET XML Parser (probably .NET 1.0, but I'm not sure)
Xerces-J 2.5.1
XSV 2.10-1

Doug Domeny
Software Analyst
Ektron, Inc.
+1 603 594-0249 x212

-----Original Message-----
From: Asgeir Frimannsson [mailto:asgeirf@gmail.com] 
Sent: Tuesday, October 17, 2006 8:13 PM
To: xliff-comment@lists.oasis-open.org
Subject: [xliff-comment] Schema issues with extensible attributes

Hi all,

I just noticed that the deprecated attributes from 1.1 (eg. ts, tool) are
still being accepted in 1.2 using the strict schema. They are defined with
use="prohibited" in the strict schema. A good example of this is the example
XLIFF file provided with the specification
(Sample_AlmostEverything_1.2_strict.xlf) - the file still includes all
prohibited attributes, and validates fine with schema validators.

At first I thought this was a bug in the validator I'm using, but then i
noticed how the attribute extension points are defined in the XLIFF schema
(transitional and strict):

      <xsd:anyAttribute namespace="##any" processContents="lax"/>

The XLIFF specification states that "Attributes of a namespace different
than XLIFF can be included in several XLIFF elements". The schema allows for
attributes of any namespace to be included, including xliff-namespace
attributes not defined in the specification. The schema and specification
are inconsistent here, and it seems the right thing to do would be to change
all anyAttribute elements to:

      <xsd:anyAttribute namespace="##other" processContents="lax"/>

In addition, some issues with the strict sample XLIFF file provided with the
 - schemaLocation points to xliff-core-1.2-strict-20060512.xsd (should point
to xliff-core-1.2-strict.xsd)
 - As noted, It still includes the prohibited attributes (eg. tool, ts)

And similar with the transitional sample XLIFF file:
 - schemaLocation points to xliff-core-1.2-transitional-20060512.xsd (should
point to xliff-core-1.2-transitional.xsd)


Asgeir Frimannsson
PhD Candidate
School of Software Engineering and Data Communications
Queensland University of Technology
126 Margaret Street, Level 3
Brisbane QLD 4001, Australia

Phone: (+61) 7 3138 9332 Mob: (+61) 405 412 696
Email: a.frimannsson@qut.edu.au


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