- From: Michael Kay <mike@saxonica.com>
- Date: Fri, 9 Oct 2015 15:56:31 +0100
- To: timothymarc@freenet.de
- Cc: xmlschema-dev@w3.org
Your text has got corrupted in transit, but I think the second interpretation is correct. If the content model of B is X, and C extends B with a content model Y, the the combined content model is sequence(X, Y). The relevant rule is in XSD 1.1 Part 1 section 3.4.2.3.3 clause 4.2.3.3, which states: {term} a model group whose {compositor} is sequence and whose {particles} are the ·base particle· followed by the ·effective content·. Michael Kay Saxonica > On 9 Oct 2015, at 08:42, timothymarc@freenet.de wrote: > > Hi all, > > I am struggling with the exact semantics of extension regardingthe derivation of the content model. Please see the following two types: > > xs:complexType name="CT10Sequence"> > xs:sequence> > xs:element maxOccurs=“3" name=“e1" type="tns:CT1"/> > xs:sequence> > xs:complexType> > > xs:complexType name="CT11Sequence"> > xs:complexContent> > xs:extension base="tns:CT10Sequence"> > xs:choice> > xs:element maxOccurs=“3" name=“e2 "type="tns:CT1"/> > xs:choice> > xs:extension> > xs:complexContent> > xs:complexType> > > The question that bothers me for quite a long time now is: whichof the following two “virtual” types corresponds to the semantics ofCT11Sequence regarding the content model? > > 1. The content model of CT11Sequence incorporatesthe content model of CT10Sequence > xs:complexType name="CT11Sequence_Derived1"> > xs:choice> > xs:element maxOccurs=“3" name=“e2" type="tns:CT1"/> > xs:sequence> > xs:element maxOccurs=“3" name=“e1" type="tns:CT1"/> > xs:sequence> > xs:choice> > xs:complexType> > > 2. The content model of CT10Sequence remains onfirst position and incorporates the content model of CTSequence11 > xs:complexType name="CT11Sequence_Derived2"> > xs:sequence> > xs:element maxOccurs=“3” name=“e1" type="tns:CT1"/> > xs:element maxOccurs=“3" name=“e2" type="tns:CT1"/> > xs:choice> > xs:sequence> > xs:complexType> > > The difference is substantial, for in the first alternative exclusivelyeither of the elements can appear, whereas in the second alternative element e1and e1 must occur but in the exact order. > > I am grateful for any hint. According to my validator, the second alternative should be the correct interpretation, but I would like to get other expert opinions and maybe also a hint to the XSD spec where this semantics is described. > > > Best regards, > Timothy > Normal 0 false false false EN-GB X-NONE X-NONE table.MsoNormalTable > > > > --- > Alle Postfächer an einem Ort. Jetzt wechseln und E-Mail-Adresse mitnehmen! http://email.freenet.de/basic/Informationen > > >
Received on Friday, 9 October 2015 14:56:57 UTC