Skip to Main Content
XML Schema
book

XML Schema

by Eric van der Vlist
June 2002
Intermediate to advanced content levelIntermediate to advanced
396 pages
11h 8m
English
O'Reilly Media, Inc.
Content preview from XML Schema

Name

xs:choice(outside a group) — Compositor to define group of mutually exclusive elements or compositors.

Synopsis

<xs:choice
           id                 = xs:ID
           maxOccurs          = ( xs:nonNegativeInteger | “unbounded” ) : “1”
           minOccurs          = xs:nonNegativeInteger : “1”
           {any attributes with non-schema namespace}
           >
           Content: (xs:annotation?, (xs:element | xs:group | xs:choice |
                     xs:sequence | xs:any)
          )*)
</xs:choice>

May be included in: xs:choice (outside a group), xs:choice (within a group), xs:complexType (local definition), xs:complexType (global definition), xs:extension (complex content), xs:restriction (complex content), xs:sequence (within a group), xs:sequence (outside a group)

Description

xs:choice is a compositor that defines a group of mutually exclusive particles. Only one can be found in the instance document per occurrence of the xs:choice compositor. The number of occurrences of the compositor itself is controlled by its minOccurs and maxOccurs attributes, while the number of occurrences of each particle within a single occurrence of xs:choice can be controlled by the minOccurs and maxOccurs attributes of the particles.

In addition to situations where simple choices are expressed (element “a” or “b” can be accepted here), xs:choice is often used to work around the limitations of xs:all and to define content models where an unlimited number of elements can be found in any order (see the example).

When the particle used in a xs:choice compositor is an element, a similar effect may be achieved using substitution ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

XML in a Nutshell, 3rd Edition

XML in a Nutshell, 3rd Edition

Elliotte Rusty Harold, W. Scott Means
Beginning XML, 5th Edition

Beginning XML, 5th Edition

Danny Ayers, Liam R.E. Quin, Joe Fawcett
XML Schema Complete Reference, The

XML Schema Complete Reference, The

Cliff Binstock, Chris Galtenberg, Mike Wooding, Chris Dix, Mitchell Smith, Dave Peterson
Programming Web Services with SOAP

Programming Web Services with SOAP

James Snell, Doug Tidwell, Pavel Kulchenko

Publisher Resources

ISBN: 0596002521Supplemental ContentErrata Page