5469 2008-02-08 23:04:48 +0000 substitution groups not that strictly limited 2016-06-23 03:55:42 +0000 1 1 1 Unclassified XML Schema Structures: XSD Part 1 1.0 only Macintosh All NEW http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/#Declarations_Summary P4 normal --- 5074 1 cmsmcq cmsmcq mostafa.shahdadi xan.gregg www-xml-schema-comments oldest_to_newest 18925 0 cmsmcq 2008-02-08 23:04:48 +0000 +++ This bug was initially created as a clone of Bug #5074, to allow an issue reported for 1.1 to be tracked for 1.0 also +++ The substitution group definition (below) says member names can vary widely but that member types are "strictly limited". This may be technically true, but seems to suggest a false sense of security in use of substitution groups. By default, with no derivation constraints, a substitution group can transitive include wildly different types. That is, a restriction step can remove all optional content and an extension step could introduce completely different content. If my analysis is correct, please consider a milder statement and/or a warning about unintentional extensibility. --------------------- 2.2.2.2 Element Substitution Group All such members must have type definitions which are either the same as the head's type definition or restrictions or extensions of it. Therefore, although the names of elements can vary widely as new namespaces and members of the ·substitution group· are defined, the content of member elements is strictly limited according to the type definition of the ·substitution group· head. 18926 1 cmsmcq 2008-02-08 23:06:29 +0000 Adding Xan Gregg to CC list, as the originator of the comment (w.r.t. 1.1).