Namespaces are a way to associate a group of elements with each other.
<wire:order xmlns:wire=" <wire:store>
<wire:shirt xmlns:wire="http:/www.wire-man.com/ns/shirts"> <!-->覆蓋realname,不能覆蓋localname<-->
<wire:color>purple</wire:color>
</wire:shirt>
</wire:store>
</wire:order>
多個(gè)namespaces
<wire:order xmlns:wire=" <wire:store>
<wire:shirt xmlns:stitch="http:/www.wire-man.com/ns/stitch"> <!-->2個(gè)<-->
<wire:color>
<stitch:shade>lavender</stitch:shade>
</wire:color>
</wire:shirt>
</wire:store>
</wire:order>
Namespaces and attributes
元素前面加prefix，參數(shù)前面不用加
Namespaces and DTDs
DTD不支持Namespaces,只是當(dāng)作一個(gè)attribute.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE wire:order [
<!ELEMENT wire:order (wire:store)> <!-->元素前加上prefix<-->
<!ATTLIST wire:order xmlns CDATA #FIXED " <!ELEMENT wire:store (#PCDATA)>
]>
<wire:order xmlns=" <wire:store>Stitch Store</wire:store>
</wire:order>
Namespaces are not technically part of the XML 1.0 spec, thus,namespaces have nothing to do with the validity of an XML document.
Namespace and XML Schema
<!-->XML FILE<-->
<?xml version="1.0" encoding="UTF-8" ?>
<pants:order
xmlns:xsi=" xsi:noNamespaceSchemaLocation="namespace2.xsd"
xmlns:pants=" <store>30 paisley capri</store> <!-->這個(gè)元素不在namespaces中<-->
</pants:order>
<!-->XML Schema FILE namespace2.xsd<-->
<?xml version="1.0" encoding="UTF-8" ?>
<xsd:schema <!-->定義一個(gè)namespace所有內(nèi)容都飽含再一個(gè)xsd:schema元素內(nèi)<-->
xmlns:xsd=" targetNamespace=" xmlns:wire="
<xsd:element name="order">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="store" type="xsd:string" />
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>
××上面例子中注意xmlns:pants，targetNamespace， xmlns:wire是使用一樣得URI值。
Assign the namespaces to all elements is elementFormDefault="qualified"
...
<xsd:schema
xmlns:xsd=" targetNamespace=" xmlns:wire=" elementFormDefault="qualified">
...
Assign the namespaces to the individule element
...
<xsd:element name="order">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="store" type="xsd:string" form="qualified"/> <!-->***<-->
</xsd:sequence>
</xsd:complexType>
</xsd:element>
...
Exclude an element from the namespace
...
<xsd:element name="order">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="store" type="xsd:string" form="unqualified"/> <!-->***<-->
</xsd:sequence>
</xsd:complexType>
</xsd:element>
...