Get a list of all schemas referenced in an XML document?

External namespaces or locations referenced in include, import, and redefine elements of a schema are resolved with respect to the base URI of the schema that includes or imports them. For example, if the base URI of the including or importing schema is empty or null, the external locations are resolved with respect to the current directory. The XmlUrlResolver class is used to resolve external schemas by default.

To disable resolution of include, import, and redefine elements of a schema, set the XmlResolver property to null. The XmlSchemaSet class uses the System.Text. Regex class to parse and match regular expressions in an XML schema.

Validation of pattern facets with regular expressions in an XML schema may involve increased CPU usage and should be avoided in high availability scenarios. Exceptions raised as a result of using the XmlSchemaSet class, such as the XmlSchemaException class may contain sensitive information that should not be exposed in untrusted scenarios. For example, the SourceUri property of an XmlSchemaException returns the URI path to the schema file that caused the exception.

The SourceUri property should not be exposed in untrusted scenarios. Exceptions should be properly handled so that this sensitive information is not exposed in untrusted scenarios.