[xsd-users] setValidationScheme

[Zhang, Yan]

Hello there,
I got this email address from my colleague. We're trying to understand the following method:
setValidationScheme<https://xerces.apache.org/xerces-c/apiDocs-3/classSAXParser.html#ac8aec6a77c18efccbf799123311047d1>

This method allows users to set the validation scheme to be used by this parser.

The value is one of the ValSchemes enumerated values defined by this class:

Val_Never - turn off validation
Val_Always - turn on validation
Val_Auto - turn on validation if any internal/external DTD subset have been seen

The parser's default state is: Val_Never.
Parameters
newScheme
The new validation scheme to use.

We found that if we set this to Val_Always, the name space and the xsd location are required in the data. Here is an example:
Xsd:
<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs=http://www.w3.org/2001/XMLSchema version="1.1.0">
               <xs:element name="ITS" type="ITS"/>
               <xs:complexType name="ITS">
                              <xs:sequence>
                                             <xs:element name="Header" type="xs:string" minOccurs="1" maxOccurs="1"/>
                              </xs:sequence>
               </xs:complexType>
</xs:schema>

Xml Data:
<?xml version="1.0"?>
<ITS xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation=<http://www.w3.org/2001/XMLSchema-instance"%20xsi:noNamespaceSchemaLocation=>"ITS.xsd" >
<Header>NIL</Header>
</ITS>

After calling setValidationScheme with Val_Always, the highlighted attributes in the data are required to pass the validation, while calling with Val_Never, the highlighted attributes can be removed without causing the validation failure.
Is it OK to set to Val_Never in this case?

Thanks in advance,
Yan Zhang


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