Consider the following scenario:
- You run an application on a computer that is running one of the following operating systems:
- Windows XP
- Windows Server 2003
- Windows Vista
- Windows Server 2008
- Windows Server 2008 R2
- Windows 7
- The application uses Microsoft XML Core Services (MSXML) to process XHTML files.
- The application generates many requests when it tries to retrieve well known Document Type Definition (DTD) files from a World Wide Web Consortium (W3C) Web server.
- These redundant retrieval requests cause the W3C server to block the DTD requests.
In this scenario, XHTML parsing fails.