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XML Companion, The, Third Edition by Neil Bradley

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URL references

XML documents often contain references to URLs. A URL reference (properly, a URI reference) is a complete, extended or partial reference to a URL. It may include information that has been appended to the end of the URL to indicate processing that is to take place after the resource has been retrieved, or it may be incomplete simply to avoid unnecessary repetition of the host name, port number or file path, or to allow interlinked documents to be moved as a group to another system location, without the need to edit all the references.

When the URL reference is incomplete, the program that interprets the reference must fill in the blanks. A relative URL reference is resolved into a complete URL by the application processing the reference, ...

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