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7/8/2002 1:21:58 PM, "Dare Obasanjo" <dareo@m...> wrote: >For those out there that may not know what W3C XML Schema was supposed to achieve I suggest looking at the requirements from 1999[0] particularly the structures[1] and data types[2] sections > >[0] http://www.w3.org/TR/NOTE-xml-schema-req >[1] http://www.w3.org/TR/NOTE-xml-schema-req#Structural >[2] http://www.w3.org/TR/NOTE-xml-schema-req#Datatype Hmm, that's an interestingly irreconciliable (in retrospect of course!) set of constraints: "optimized for interoperability; simple enough to implement with modest design and runtime resources; The XML schema language specification shall: be prepared quickly; be precise, concise, human-readable, and illustrated with examples." and " mechanisms to enable inheritance for element, attribute, and datatype definitions; provide for primitive data typing, including byte, date, integer, sequence, SQL & Java primitive data types, etc.; define a type system that is adequate for import/export from database systems (e.g., relational, object, OLAP); distinguish requirements relating to lexical data representation vs. those governing an underlying information set; allow creation of user-defined datatypes, such as datatypes that are derived from existing datatypes and which may constrain certain of its properties (e.g., range, precision, length, mask)."
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