Validating against XML Schema question.

[AP]

Hello,

I'm trying to use .NET to validate incoming XML documents against the
appropriate schema in our database. I do not want to use the document's
schemaLocation attribute to validate for various reasons, but rather check
against a schema that I pull from a database and add to the reader's schema
collection. I am curious as to why the XmlValidatingReader fires an event
when the document is invalid, rather than throwing an exception? This makes
developing a method to do this a lot harder. Is there some reason it has
been implemented this way?

Thanks,

Adam

[j t]

My guess is this will allow you to ignore certain errors. If an exception is
thrown, you can't validate the rest of the document. Just a guess.

On a side note, I'm having trouble getting the XmlValidatingReader to work.
I've created both an xml & xsd file, and they pass validation through xml
spy. However, when I run it through the XmlValidatingReader I'm getting the
errors

'Could not find schema information for the element <myElement>'

and

'Could not find schema information for the attribute <myAttribute>'

also

'The attribute targetNamespace does not match the designated namespace URI'

for every element & attribute in the document.

why would it validate for one and not the other?

thanks,

jason

"AP" <ad***@indra.com> wrote in message
news:<ex*************@tk2msftngp13.phx.gbl>...

Hello, I'm trying to use .NET to validate incoming XML documents against the appropriate schema in our database. I do not want to use the document's schemaLocation attribute to validate for various reasons, but rather check against a schema that I pull from a database and add to the reader's schema
collection. I am curious as to why the XmlValidatingReader fires an event when the document is invalid, rather than throwing an exception? This makes
developing a method to do this a lot harder. Is there some reason it has been implemented this way? Thanks, Adam

[Bob]

Here is something I did in C++ that will solve your problem of it not working. Also an example of XML/XSD. This will throw the exception

FileStream *myFile = new FileStream(pNoteFilename, System::IO::FileMode::Open, System::IO::FileAccess::Read)
StreamReader *myReader = new StreamReader(myFile)
XmlTextReader *tr = new XmlTextReader(myReader)
XmlDocument *myXmlDataDocument = new XmlDocument

// Set up the Schema for validatio
strSchema.Format(TEXT("%s/Notes/notes.xsd"), theApp.LocalDir)
FileStream *mySchema = new FileStream(strSchema, System::IO::FileMode::Open, System::IO::FileAccess::Read)
StreamReader *mySchemaReader = new StreamReader(mySchema)
XmlTextReader *sr = new XmlTextReader(mySchemaReader)

XmlSchemaCollection* myXmlSchemaCollection = new XmlSchemaCollection()
tr

myXmlSchemaCollection->Add("notes.xsd" , sr)

catch (System::Exception *z

CString strTemp = z->Message->ToString()
AfxMessageBox(strTemp)
return(_FAILED_)

XmlValidatingReader *valReader = new XmlValidatingReader(tr)
valReader->ValidationType = ValidationType::Auto
valReader->Schemas->Add(myXmlSchemaCollection)

tr

myXmlDataDocument->Load(valReader)

catch(System::Exception *e

CString strError = e->Message->ToString()
AfxMessageBox(strError)
myFile->Close()
return(_FAILED_)
#### First part of schem

<?xml version="1.0" ?><xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema
xmlns="notes.xsd
elementFormDefault="qualified
targetNamespace="notes.xsd"

#####

First part of XM

?xml version="1.0" encoding="utf-8"?><IADSNOTES xmlns="notes.xsd" count="1">

[Peter Theill]

> I am curious as to why the XmlValidatingReader fires an event

when the document is invalid, rather than throwing an exception? This makes developing a method to do this a lot harder.

It only fires an event if you set an event handler. If no event handler is
provided an XmlException is thrown on the first validation error (Severity
is equal to XmlSeverityType.Error). E.g.

Regards,
Peter Theill