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== <all> Declarations==



<source lang="xml">
<all> says that the elements within your content model may appear in any order.
<all> must be the only content model declaration that appears as a child of a <complexType> definition.
<all> cannot contain <sequence>, <choice>, or <group> declarations.
<all> declaration"s children may appear once each in the instance document.
Within the <all>, the values for minOccurs/maxOccurs are limited to 0 or 1.
<all> is used when the expected content is known, but not the order.
Suppose you declared the <name> content model using the <all>:
<element name="name"
<complexType>
<all>
<element name="first" type="string"/
<element name="middle" type="string"/
<element name="last" type="string"/
</all>
<attribute name="title" type="string"/
</complexType>
</element>

The allowable content for a <name> element declared using an <all> declaration might include
<name>
<first>first</first>
<middle>middle</middle>
<last>last</last>
</name>
or
<name>
<first>first</first>
<last>last</last>
<middle>middle</middle>
</name></source>

== Allowing Elements to Appear in Any Order==



<source lang="xml">
The members of an "all" group may appear once or not at all, in any order.
The minOccurs and maxOccurs attributes may only be set to 0 or 1.
An all group can only contain individual element declarations or references, not other groups.
An all group can only be contained either a complex type definition or a named group definition.
File: Schema.xsd
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.wbex.ru"
xmlns="http://www.wbex.ru"
elementFormDefault="qualified">
<xsd:element name="subspecies" type="subspeciesType"/>
<xsd:complexType name="subspeciesType">
<xsd:all>
<xsd:element name="region" type="xsd:string" minOccurs="0" />
<xsd:element name="population" type="xsd:string" />
</xsd:all>
</xsd:complexType>
</xsd:schema>

File: Data.xml
<?xml version="1.0"?>
<subspecies xmlns="http://www.wbex.ru">
<population>3159</population>
<region>India</region>
</subspecies></source>

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