[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Schemas and Other Crucial XML Questions
Tyler Baker wrote: > David Megginson wrote: > > > Sam Gentile writes: > > > > > > Also, we have been hearing rumors of a "short" XML notation. Is > > > > there one? We have a need to reduce the size of our buffers. > > > > No, there is no such thing. XML's parent, SGML, included extensive > > facilities for markup minimisation and has suffered badly for it, > > since SGML tools are far too difficult to write (there is still not a > > single Java-based SGML parser, beside probably more than a dozen > > Java-based XML parsers). > > > > There are, however, alternatives: for example, you could compile the > > XML to a compact binary format for internal storage then decompile it > > back to a verbose format for export -- there's no requirement to store > > it internally as text. > > Simple some very simple compression algorithms like Huffman encoding for > instance, do very well with XML documents as the Name production that is used for > identifying tags among other things will be converted to some binary symbol that > is used as an index to lookup the actual name production. In fact, you could do > this all with entities by simply taking all of the Names specified in the DTD, > spit them into a List, and then declare all entities. > > You could index all of this by using base 10 digits or else use something as high > as base 64 to encode the array references. > > <!ENTITY % 0 "Foo"> > <!ENTITY % 1 "Bar"> > > Then for a document which had element types with names "Foo" and "Bar" occurences > of: > > <foo></foo> > <bar></bar> > > would be converted to: > > <0></0> > <1></1> Please forgive any confusion I may have caused but this is not valid XML as digits are not allowed as the first character in a name (only Letter's and the characters '_' and ':'). In this case, instead of using numeric digits, use characters that are Letters and simply map each letter to a corresponding digit value. Tyler 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/ 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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