The XmlReader class can enforce validation using a document type definition (DTD) or XML Schema definition language (XSD) schema. Settings on the XmlReaderSettings object used by the Create method determine what type of data validation, if any, the XmlReader object supports.
Validation Settings
The following table details the validation-specific settings on the XmlReaderSettings class.
Specifies an event handler for receiving information about validation events. If an event handler is not provided, an XmlException is thrown on the first validation error.
AllowXmlAttributes - Allow XML attributes (xml:*) in instance documents even when they are not defined in the schema. The attributes are validated based on their data type.
This setting is disabled by default.
ProcessIdentityConstraints - Process identity constraints (xs:ID, xs:IDREF, xs:key, xs:keyref, xs:unique) encountered during validation.
This setting is enabled by default.
ProcessSchemaLocation - Ignores schemas specified by xsi:schemaLocation or xsi:noNamespaceSchemaLocation attributes.
This setting is disabled by default.
ProcessInlineSchema - Indicates that inline XML Schemas should be processed during validation.
This setting is disabled by default.
ReportValidationWarnings - Indicates that events should be reported if a validation warning occurs. A warning is typically issued when there is no DTD or XML Schema to validate a particular element or attribute against. The ValidationEventHandler is used for notification.
This setting is disabled by default, and applies to DTD or schema validation.
Specifies the XmlResolver used to resolve and access any external resources. This can include external entities (for example, DTD and schema locations). The XmlResolver is also used to process any xs:include or xs:import elements contained in the XML Schema. If an XmlResolver is not specified, the XmlReader uses a default XmlUrlResolver with no user credentials.