2232 2005-09-14 19:33:39 +0000 R-240: Question re: Particle Derivation OK (All/Choice/Sequence:Any -- NSRecurseCheckCardinality) 2016-06-23 03:56:32 +0000 1 1 1 Unclassified XML Schema Structures: XSD Part 1 1.0 only All All ASSIGNED unclassified P4 normal --- 1 sandygao cmsmcq mostafa.shahdadi www-xml-schema-comments oldest_to_newest 6258 0 sandygao 2005-09-14 19:33:39 +0000 I think the following passage in Part 1 is wrong: Schema Component Constraint: Particle Derivation OK (All/Choice/Sequence:Any -- NSRecurseCheckCardinality) For a group particle to be a valid restriction of a wildcard particle all of the following must be true: 1 Every member of the {particles} of the group is a valid restriction of the wildcard as defined by Particle Valid (Restriction) (3.9.6). [...] If understood literally, this is saying that a particle of a model group can be a valid restriction of a wildcard. How can a particle be a valid restriction of a **wildcard** (as opposed to a **particle whose term is a wildcard**)? If, instead, I interpret it as: "1 Every member of the {particles} of the group is a valid restriction of the wildcard **particle** as defined by Particle Valid (Restriction) (3.9.6)." it becomes clearly wrong, given that the min occurs and max occurs of the "base" particle and the min occurs and max occurs of the "restricted" particle have a role in determining whether a "restricted" particle (say, an element declaration particle) is a valid restriction of a "base" particle (say, a wildcard particle). For example, suppose I want to restrict a wildcard particle (min occurs=4, max occurs=8) with a sequence particle whose term has three element declaration particles. The statement above would require that **each** of the element declaration particles was a valid restriction of the wildcard particle, which in turn implies that **each** of the element declaration particles had to have min occurs>=4, max occurs<=8 (see 3.9.6, Schema Component Constraint: Particle Derivation OK (Elt:Any -- NSCompat)). This makes no sense. A possible correction is rewording the sentence as follows: 1 Every member of the {particles} of the group is a valid restriction of the wildcard particle as defined by Particle Valid (Restriction) (3.9.6), except that the min occurs of the wildcard particle must be replaced by 0 before applying Particle Valid (Restriction) (3.9.6). or perhaps as follows: 1 Every member of the {particles} of the group is a valid restriction (as defined by Particle Valid (Restriction) (3.9.6)) of a particle constructed as follows: min occurs: 0 max occurs: the same as the max occurs of the wildcard particle term: the wildcard See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2003OctDec/0031.html 6259 1 sandygao 2005-09-14 19:33:48 +0000 See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2004JanMar/0000.html 11981 2 cmsmcq 2006-09-23 22:10:46 +0000 The schema component constraint in which this issue arises has been deleted from 1.1 as part of the clarification of restriction. So the comment applies to 1.0 only, now, and I am changing the 'version' value accordingly.