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Alexander Falk of Altova, the XML Spy people, posted the following to an internal W3C mailing list. With his permission, I am reposting it here so that it will be archived. Anyone may use it, but this information is provided "as-is" with no warranties whatsoever regarding the correctness of the information. ----- Forwarded message from Alexander Falk ----- This is the Regular Expression (RE) we originally used for the anyURI dataype within our XML Spy product up until 4.0b2: (([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)?/{0,2}[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?( #[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)? It was constructed according to the BNF grammar given in RFC 2396 (http://www.ietf.org/rfc/rfc2396.txt) and we used this RE to validate elements and attributes whose datatype was anyURI. However, we've found that (a) many customers actually use illegal URIs in their documents happily, (b) XML Schema Part 2 (http://www.w3.org/TR/xmlschema-2/#anyURI) doesn't require any validation of the contents of the anyURI dataype, and (c) most customers don't want us to validate stronger than what other processors are doing. Therefore, we are currently eliminating the anyURI checking [...] -- John Cowan http://www.ccil.org/~cowan cowan@c... Please leave your values | Check your assumptions. In fact, at the front desk. | check your assumptions at the door. --sign in Paris hotel | --Miles Vorkosigan
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