Validation ignores fixed attribute

[Stefan Hoffmann]

hi @all,

I'm trying to validate a XML against a schema using the example from the
MSDN:

http://msdn.microsoft.com/en-us/libr...ationtype.aspx

In my case this seems to validates my file, because the
ValidationCallBack handler is not called.
But the file is invalid due to a wrong fixed attribute.

I don't know why, so any clue is appreciated.

My GPX (GPS Exchange Format) file:

<?xml version="1.0"?>
<gpx
version="1.0"
creator="Holux Utility"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.topografix.com/GPX/1/0"
xsi:schemaLocation="http://www.topografix.com/GPX/1/0
http://www.topografix.com/GPX/1/0/gpx.xsd">

<wpt lat="48.342567" lon="10.865602">
<ele>137.59</ele>
<time>2008-09-03T15:17:23Z</time>
<name><![CDATA[Point 0]]></name>
</wpt>

<wpt lat="48.342548" lon="10.865611">
<ele>137.72</ele>
<time>2008-09-03T15:17:24Z</time>
<name><![CDATA[Point 1]]></name>
</wpt>

</gpx>

My code looks like this (.Net 3.5, dlgFileOpen.FileName points to the
file above):

XmlSchemaSet sc = new XmlSchemaSet();
sc.Add("http://www.topografix.com/GPX/1/1", "Resources\\gpx-1.1.xsd");

XmlReaderSettings settings = new XmlReaderSettings();
settings.ValidationType = ValidationType.Schema;
settings.Schemas = sc;
settings.ValidationEventHandler += new
ValidationEventHandler(ValidationCallBack);

XmlReader reader = XmlReader.Create(dlgFileOpen.FileName, settings);
while (reader.Read()) ;

mfG
--stefan <--

[Martin Honnen]

Stefan Hoffmann wrote:

<gpx
version="1.0"
creator="Holux Utility"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.topografix.com/GPX/1/0"

So here the namespace URI is http://www.topografix.com/GPX/1/0
while later on you add a schema for

XmlSchemaSet sc = new XmlSchemaSet();
sc.Add("http://www.topografix.com/GPX/1/1", "Resources\\gpx-1.1.xsd");

http://www.topografix.com/GPX/1/1 which is different. Make sure you add
a schema for the namespace your XML instance document uses, otherwise
validation will only emit some warnings that no matching schema is found
and your code

XmlReaderSettings settings = new XmlReaderSettings();
settings.ValidationType = ValidationType.Schema;
settings.Schemas = sc;
settings.ValidationEventHandler += new
ValidationEventHandler(ValidationCallBack);

will not even so those warnings as you do not have the ValidationFlags
set on your settings object to ReportValidationWarnings.

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Stefan Hoffmann]

hi Martin,

Martin Honnen wrote:

will not even so those warnings as you do not have the ValidationFlags
set on your settings object to ReportValidationWarnings.

Thanks.

btw, is there any idiom to detect the necessary schema for a XML file?
In my GPX case there are two schemas.

I'm considering using this for the XmlReaderSettings.Schemas:

XmlSchemaSet sc = new XmlSchemaSet();
sc.Add("http://www.topografix.com/GPX/1/0", "Resources\\gpx-1.0.xsd");
sc.Add("http://www.topografix.com/GPX/1/1", "Resources\\gpx-1.1.xsd");

So when the validation handler is not called, then one schema applies to
the file.

Is this correct?

mfG
--stefan <--

[Martin Honnen]

Stefan Hoffmann wrote:

btw, is there any idiom to detect the necessary schema for a XML file?
In my GPX case there are two schemas.

I'm considering using this for the XmlReaderSettings.Schemas:

XmlSchemaSet sc = new XmlSchemaSet();
sc.Add("http://www.topografix.com/GPX/1/0", "Resources\\gpx-1.0.xsd");
sc.Add("http://www.topografix.com/GPX/1/1", "Resources\\gpx-1.1.xsd");

So when the validation handler is not called, then one schema applies to
the file.

The validating parser will look at the namespace of the root element of
the XML document to be validated and then check for a schema with a
matching targetNamespace in its XmlSchemaSet. If it does not find a
matching schema then a warning is issued. If a matching schema is found
the parser checks whether there is a top level defintion for the root
element and validates against that definition, reporting errors as
needed to the handler. If there is no top level definition for the root
element then this is also an error. So the above should work.

Note that you can shorten the code, there is no need to explicitly
create and assing an XmlSchemaSet, you can simply call
settings.Schemas.Add. And passing in the schema URI to the Add method is
not necessary, if you pass in null for that parameter then it simply
uses the targetNamespace of the schema passed in as the second argument.
--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Stefan Hoffmann]

hi Martin,

Martin Honnen wrote:

>XmlSchemaSet sc = new XmlSchemaSet();
sc.Add("http://www.topografix.com/GPX/1/0", "Resources\\gpx-1.0.xsd");
sc.Add("http://www.topografix.com/GPX/1/1", "Resources\\gpx-1.1.xsd");

Note that you can shorten the code, there is no need to explicitly
create and assing an XmlSchemaSet, you can simply call
settings.Schemas.Add. And passing in the schema URI to the Add method is
not necessary, if you pass in null for that parameter then it simply
uses the targetNamespace of the schema passed in as the second argument.

Ah, cool. Thanks a lot.
mfG
--stefan <--