[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] XML Schema: Chameleon Redefine Pervasiveness Puzzle
Start Situation ---------------- Schema A: no target namespace 1 simpleType "T" being a union of a specific "enumeration of QNames" and "QNames". Rationale: The enumeration must be restrictable and/or extensible. Schema B: targetnamespace 'B' includes Schema A as a chameleon hence simpleType "T" becomes part of the namespace 'B': {B}:T one element {B}:a has datatype simpleType {B}:T Schema C: targetnamespace 'C' includes Schema A as a chameleon hence simpleType "T" becomes part of the namespace 'C': {C}:T one element {C}:x has datatype simpleType {C}:T Schema D: targetnamespace 'D' imports Schema B and Schema C. Redefine with 2 schemafiles added --------------------------------- Schema BB: targetnamespace 'B' redefines Schema B by extending the enumeration in simpleType {B}:T Schema CC: targetnamespace 'C' redefines Schema C by restricting the enumeration in simpleType {C}:T Schema D: targetnamespace 'D' imports now schema 'BB' and schema 'CC' Functionality sought-after: element {B}:a can use a value of the extended enumeration element {C}:x can only use values from the restricted enumeration Pervasive impact ---------------- Redefinitions replace the original definitions. My question is how far this impact goes. Possibility 1: Does the redefinition stop at the level of {B}:T and {C}:T in the two schemas with the targetnamespaces? Possibility 2: Or goes it one step further by replacing the chameleon datatype 'T', which leads to a conflict since one redefinition is a restriction and the other is an extension. Is there one of the redefenitions that takes priority than? Anyhow, if possibility 2 is the case than I cannot achieve with redefine the functionality sought-after (see above). Is there another option to implement this feature: starting with one template enumeration (union) which can be extended in one namespace and restricted in a second without the use of xsi:type? Thanks, Paul
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