[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] example and explanation of substitutionGroup in Schema
Suppose I have a user who has defined many elements. For various reasons, e.g. to hold common attributes, it was decided to enclose each element in a common wrapper element. Using DTD notation (because it is terser) the content model might look like <!ELEMENT wrapper ( elem1 | elem2 | ... | elem999) > I know I could translate this directly to Schema. But then adding or renaming an element requires changing two places. I think that an alternate way of expressing this, maybe, is to use a substitutionGroup. <element name="dummyElement" abstract="true" type="decimal" substitutionGroup="myElement"/> <element name="elem1" substitutionGroup="myElement"/> <element name="elem2" substitutionGroup="myElement"/> ... <element name="elem999" substitutionGroup="myElement"/> What are the pro's and con's of this? One pro that I can see is that adding an element is easier, in that one one place in the Schema needs to be changed. Also, the above was cobbled together based on the example in schema1.html. The syntax might not be correct. I could not understand the prose describing the substitutionGroup feature. Is there an clearer writeup of this, with examples, anyplace? Thanks, Steve -- Steven Tolkin steve.tolkin@f... 617-563-0516 Fidelity Investments 82 Devonshire St. V10D Boston MA 02109 There is nothing so practical as a good theory. Comments are by me, not Fidelity Investments, its subsidiaries or affiliates.
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