XML Schema union Element

|  | Search W3Schools : |

HOME | HTML | CSS | XML | JAVASCRIPT | ASP | PHP | SQL | MORE... |  | References | Examples | Forum | About

ADVERTISEMENTS XML Certification Download XML editor Custom Programming |  |

Table of contents

Schema Tutorial
XSD HOME
XSD Intro
XSD Why Use
XSD How To
XSD <schema>
Simple Types
XSD Elements
XSD Attributes
XSD Restrictions
Complex Types
XSD Elements
XSD Empty
XSD Elements Only
XSD Text Only
XSD Mixed
XSD Indicators
XSD <any>
XSD <anyAttribute>
XSD Substitution
XSD Example
Data Types
XSD String
XSD Date
XSD Numeric
XSD Misc
XSD Editor
XSD Summary
References
XSD Reference
XSD Validator

Selected Reading

Web Statistics
Web Glossary
Web Hosting
Web Quality
W3Schools Tutorials
W3Schools Forum
Helping W3Schools

# XML Schema union Element

Complete XML Schema Reference

## Definition and Usage

The union element defines a simple type as a collection (union) of values from specified simple data types.

### Element Information

- Parent elements: simpleType

### Syntax

    <union
    id=ID
    memberTypes="list of QNames"
    any attributes
    >

    (annotation?,(simpleType*))

    </union>

(The ? sign declares that the element can occur zero or one time inside the union element)

Attribute | Description
--- | ---
id | Optional. Specifies a unique ID for the element
memberTypes | Optional. Specifies a list of built-in data types or simpleType elements defined in a schema
any attributes | Optional. Specifies any other attributes with non-schema namespace

### Example 1

This example shows a simple type that is a union of two simple types:

    <xs:element name="jeans_size">
      <xs:simpleType>
        <xs:union memberTypes="sizebyno sizebystring" />
      </xs:simpleType>
    </xs:element>

    <xs:simpleType name="sizebyno">
      <xs:restriction base="xs:positiveInteger">
        <xs:maxInclusive value="42"/>
      </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="sizebystring">
      <xs:restriction base="xs:string">
        <xs:enumeration value="small"/>
        <xs:enumeration value="medium"/>
        <xs:enumeration value="large"/>
      </xs:restriction>
    </xs:simpleType>

Complete XML Schema Reference

## Altova® XMLSpy® - The world's best-selling XML editor!

Whether you're new to XML or already an advanced user, the user-friendly views and powerful entry helpers, wizards, and debuggers in XMLSpy are designed to meet your XML and Web services development needs from start to finish.

- XML editor
- Graphical XML Schema / DTD editors
- XSLT 1.0/2.0 editor, debugger, profiler
- XQuery editor, debugger, profiler
- Support for Office Open XML (OOXML)
- Graphical WSDL editor & SOAP debugger
- Java, C#, C++ code generation
- And much more!

Download a fully functional free 30-day trial today!

WEB HOSTING
ASP.NET Shopping Cart
$15 Domain Name Registration Save $20 / year!
Buy UK Domain Names Register Domain Names
Cheap Domain Names Cheap Web Hosting
Best Web Hosting
PHP MySQL Hosting
Top 10 Web Hosting
UK Reseller Hosting
Web Hosting
FREE Web Hosting

WEB BUILDING
Website Templates Flash Templates Website Builder Internet Business Opportunity
Custom Programming
FREE Trial or Demo Web Content Manager Forms,Web Alerts,RSS
Download XML editor
FREE Flash Website
FREE Web Templates

EDUCATION
US Web Design Schools
HTML Certification
JavaScript Certification
XML Certification
PHP Certification
ASP Certification

HOME or Top of Page |  | Printer Friendly
W3Schools is for training only. We do not warrant the correctness of its content. The risk from using it lies entirely with the user. While using this site, you agree to have read and accepted our terms of use and privacy policy. Copyright 1999-2009 by Refsnes Data. All Rights Reserved.