[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Lisp concrete syntax -- was: Namespaces and DTDs
On Thursday, 11 Mar 1999, Chris Maden wrote: > The parentheses are only character data. Yes. > I don't think that Lisp could be made SGML compliant; the delimiters > could be redefined, but as Steve DeRose notes in _The SGML FAQ Book_, > there are some limits to the flexibility of the redefinitions, since > some delimiter roles are overloaded. Also, Lisp doesn't have the > equivalent of start-tag close, and you can only omit tagc if the next > character is stago or etago (ISO 8879:1986, clause 7.4.1.2) which it > wouldn't be when you get to the leaves of a structure. While it is true that not all lisp can be made SGML compliant, it is possible to define a concrete syntax (using parens as tag delimiters), and establish a set of conventions such that you can create documents that are simultaneously R5RS Scheme programs and valid SGML documents. The close paren works fine as NESTC/NET if you treat the starttag as a procedure which, when evaluated, produces a procedure that will evaluate the element's contents. You can define a procedure named "!ELEMENT" which will create those starttag procedures when the DTD is evaluated. I played around with this idea a bit. You can see a working example with the SGML declarations, DTD (which also uses Scheme syntax), and Scheme bootstrap code (or the rules for evaluating *x-expressions*) at: http://www.diac.com/~lindsey/lml Enjoy, Bill xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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