[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XML Schemas: Best Practices
Jeff Rafter wrote: > > Eddie, > > > I may be on thin ice here but I don't think this is correct. If you use > > derivation using the above syntax you're not reordering the elements. > Instead > > you are extending the type to allow for all the elements in the base type > > I believe you are right. I think that Martin's intent was to use a > restriction element instead of an extension element (correct me if I am > wrong). This would make his example: > > <complexType name="BookTypePlusReviewer"> > <complexContent> > <restriction base="c:BookType" > > <sequence> > <element name="Reviewer" type="string"/> > <element name="Title" type="string"/> > <element name="Author" type="string"/> > <element name="Date" type="year"/> > <element name="ISBN" type="string"/> > <element name="Publisher" type="string"/> > </sequence> > </restriction> > </complexContent> > </complexType> Great discussions! No, using <restriction> does not allow me to put a Reviewer element at the top of Book's content model. The <restriction> functionality only allows me to - restrict the range of values, or - restrict the number of occurrences of an element It does not allow me to add (extend) a content model. The only way to add (extend) a content model is with <extension>, and the extension is always at the end of the content model. > using: > > <any namespace="##any" minOccurs="0" maxOccurs="2"/> > > at the top of the sequence seems to be a good idea until you consider > multiple layers of inheritance-- then you realize that a more extensive (no > pun intended) solution is needed. I don't know what you mean by "multiple layers of inheritance". Could you expand upon this please? Thanks! /Roger
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