http://wbex.ru/index.php?action=history&feed=atom&title=XML_Tutorial%2FXML_Schema%2FchoiceXML Tutorial/XML Schema/choice - История изменений2026-04-04T12:29:28ZИстория изменений этой страницы в викиMediaWiki 1.30.0http://wbex.ru/index.php?title=XML_Tutorial/XML_Schema/choice&diff=10625&oldid=prevAdmin: 1 версия2010-05-26T08:26:46Z<p>1 версия</p>
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<p><b>Новая страница</b></p><div>== Allow the document instance author to use the initial element twice==<br />
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<!-- start source code --><br />
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<source lang="xml"><br />
<xsd:element name="middleName"><br />
<xsd:complexType><br />
<xsd:choice><br />
<xsd:element name="initial" type="xsd:string" maxOccurs="2"/><br />
<xsd:element name="name" type="xsd:string"/><br />
</xsd:choice><br />
</xsd:complexType><br />
</xsd:element></source><br />
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== <choice> Declarations==<br />
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<!-- start source code --><br />
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<source lang="xml"><br />
<choice minOccurs="non negative number" <br />
maxOccurs="non negative number or unbounded"> <br />
You can specify multiple child declarations within a <choice> declaration. <br />
In an instance document, only one of the declarations may be used. <br />
<choice> <br />
<element name="first" type="string" minOccurs="1" maxOccurs="unbounded"/> <br />
<element name="middle" type="string" minOccurs="0" maxOccurs="1"/> <br />
<element name="last" type="string"/> <br />
</choice> <br />
<choice> declaration may contain <element> declarations, element wild-cards, and inner <sequence>, <choice>, or <group>references.</source><br />
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== Creating a Set of Choices==<br />
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<!-- start source code --><br />
<br />
<source lang="xml"><br />
With the default minOccurs and maxOccurs attribute values (both equal to 1), only one of the elements in a set of choices can appear. <br />
If the value of the maxOccurs attribute is greater than 1, that value determines how many of the choices may appear. <br />
A set of choices can also contain nested sequences, additional choice sets, or references to named groups.<br />
A set of choices may be contained in a complex type definition, in sequences, in other sets of choices, or in named group definitions.<br />
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File: Schema.xsd<br />
<?xml version="1.0"?><br />
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"<br />
targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"<br />
elementFormDefault="qualified"><br />
<xsd:element name="animal" type="animalType" /><br />
<xsd:complexType name="animalType"><br />
<xsd:choice><br />
<xsd:element name="subspecies" type="xsd:string" /><br />
<xsd:sequence><br />
<xsd:element name="region" type="xsd:string" /><br />
<xsd:element name="population" type="xsd:integer" /><br />
</xsd:sequence><br />
</xsd:choice><br />
</xsd:complexType><br />
</xsd:schema><br />
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File: Data.xml<br />
<?xml version="1.0"?><br />
<animal xmlns="http://www.wbex.ru"><br />
<subspecies>Russia</subspecies><br />
</animal></source><br />
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== You can further express occurrence behavior by using the minOccurs and maxOccurs attributes with either the choice element or the element declarations themselves.==<br />
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<br />
<br />
<!-- start source code --><br />
<br />
<source lang="xml"><br />
<xsd:element name="middleName"><br />
<xsd:complexType><br />
<xsd:choice maxOccurs="2"><br />
<xsd:element name="initial" type="xsd:string"/><br />
<xsd:element name="name" type="xsd:string"/><br />
</xsd:choice><br />
</xsd:complexType><br />
</xsd:element><br />
The middleName element to contain one of two child elements: initial or name<br />
<middleName><br />
<initial>S</initial><br />
</middleName><br />
<middleName><br />
<name>Stolte</name><br />
</middleName><br />
To allow for this content model, we would have to use the choice element:<br />
<xsd:element name="middleName"><br />
<xsd:complexType><br />
<xsd:choice><br />
<xsd:element name="initial" type="xsd:string"/><br />
<xsd:element name="name" type="xsd:string"/><br />
</xsd:choice><br />
</xsd:complexType><br />
</xsd:element></source></div>