-A *Document Type Definition (DTD)* is one of two ways an XML parser can determine the validity of a document, as defined by the [World Wide Web Consortium (W3C) Extensible Markup Language (XML) 1.0](http://www.w3.org/TR/2008/REC-xml-20081126/). This rule seeks properties and instances where untrusted data is accepted to warn developers about potential [Information Disclosure](/dotnet/framework/wcf/feature-details/information-disclosure) threats, or which may lead to [Denial of Service (DoS)](/dotnet/framework/wcf/feature-details/denial-of-service) attacks. This rule triggers when:
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