the following resources contain additional information on xml. please use them to get more in-depth knowledge on this topic.

useful links on xml

• xml sepcification - extensible markup language (xml) 1.0 (fifth edition).

• document type definition - details of xml dtd.

• dtd validation - markup validation service

• xml schema vs dtd - a guide to show difference between xml schema and dtd.

useful books on xml

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