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XML Tutorial/XML Schema/union - История изменений
2026-04-05T02:58:45Z
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Admin: 1 версия
2010-05-26T08:26:42Z
<p>1 версия</p>
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<td colspan="1" style="background-color: white; color:black; text-align: center;">Версия 08:26, 26 мая 2010</td>
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Admin
http://wbex.ru/index.php?title=XML_Tutorial/XML_Schema/union&diff=10532&oldid=prev
в 18:22, 25 мая 2010
2010-05-25T18:22:32Z
<p></p>
<p><b>Новая страница</b></p><div>== By declaring a <union>, you can validate the values in your instance document against multiple types.==<br />
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<!-- start source code --><br />
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<source lang="xml"><br />
<union memberTypes="whitespace separated list of types"> <br />
You specify the types you are combining by including the memberTypes attribute. <br />
The value of the memberTypes attribute should be a whitespace-separated list of references to global <simpleType> definitions or built-in XML Schema datatypes. <br />
The <union> declaration also allows you to specify your memberTypes by creating local <simpleType> definitions. <br />
<simpleType name="UnknownString"<br />
<restriction base="string"<br />
<enumeration value="Unknown" /><br />
</restriction><br />
</simpleType><br />
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<simpleType name="UnknownOrFloatType"<br />
<union memberTypes="float contacts:UnknownString"/><br />
</simpleType><br />
<element name="latitude" type="contacts:UnknownStringOrFloatType"/> <br />
<element name="longitude" type="contacts:UnknownStringOrFloatType"/> <br />
Some valid elements include the following: <br />
<latitude>43.847156</latitude> <br />
<longitude>Unknown</longitude> <br />
Some invalid elements include these: <br />
<latitude>unknown</latitude> <br />
<longitude>43.847156 Unknown</longitude></source><br />
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== The union method joins the value spaces and lexical spaces of one or more datatypes to derive a new type==<br />
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<!-- start source code --><br />
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<source lang="xml"><br />
<!-- schema --><br />
<xsd:element name="recipe"><br />
<xsd:simpleType><br />
<xsd:union><br />
<xsd:simpleType><br />
<xsd:restriction base="decimal"/><br />
</xsd:simpleType><br />
<xsd:simpleType><br />
<xsd:restriction base="string"/><br />
</xsd:simpleType><br />
</xsd:union><br />
</xsd:simpleType><br />
</xsd:element><br />
<!-- instance document --><br />
<recipe>1.5</recipe><br />
<recipe>cups</recipe></source><br />
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== When the values of a union datatype are validated, they? validated in the order in which they? defined==<br />
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<!-- start source code --><br />
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<source lang="xml"><br />
<!-- schema --><br />
<xsd:element name="dog"><br />
<xsd:simpleType><br />
<xsd:union><br />
<xsd:simpleType><br />
<xsd:restriction base="nonNegativeInteger"/><br />
</xsd:simpleType><br />
<xsd:simpleType><br />
<xsd:restriction base="string"/><br />
</xsd:simpleType><br />
</xsd:union><br />
</xsd:simpleType><br />
</xsd:element><br />
<!-- instance document --><br />
<dog>15</dog><br />
<dog>hound</dog></source></div>