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IMHO this design suffers from merging of layers. The FROM address does NOT include the CR/LF, The SMTP payload protocol does. ---------------------------------------- David A. Lee dlee@c... http://www.xmlsh.org -----Original Message----- From: Pete Cordell [mailto:petexmldev@c...] Sent: Wednesday, October 24, 2012 1:14 PM To: John Cowan; Costello, Roger L. Cc: xml-dev@l... Subject: Re: Why does validation fail with a named ENTITY for carriage return and line feed? Original Message From: "John Cowan" > Costello, Roger L. scripsit: > >> I want to specify the format of a "From:" field for email messages. The >> requirement is: > > I realize this is only an example, but the definition of what can appear > in a "From:" line is *much* more complicated. See RFC 2822. Do you think this is a case where the validation should be done at another place in the tool chain? If so, even if it could be conveniently done in XSD, would you advocate doing it at a different place in the tool chain or in schema? Are there circumstances where you might say, while this pattern isn't accurate, it's good enough? Thanks for sharing your insight. Pete Cordell Codalogic Ltd Twitter: http://twitter.com/petecordell Interface XML to C++ the easy way using C++ XML data binding to convert XSD schemas to C++ classes. Visit http://codalogic.com/lmx/ or http://www.xml2cpp.com for more info _______________________________________________________________________ XML-DEV is a publicly archived, unmoderated list hosted by OASIS to support XML implementation and development. To minimize spam in the archives, you must subscribe before posting. [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ Or unsubscribe: xml-dev-unsubscribe@l... subscribe: xml-dev-subscribe@l... List archive: http://lists.xml.org/archives/xml-dev/ List Guidelines: http://www.oasis-open.org/maillists/guidelines.php
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