1.来历:qname是qualified name 的简写
2.构成:由名字空间(namespace),前缀(prefix)以及冒号(:),还有一个元素名称构成
3.举例:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
version="1.0">
<xsl:template match="foo">
<hr/>
</xsl:template>
</xsl:stylesheet>
xsl是名字空间前缀,template是元素名称,xsl:template 就是一个qname
4.总结:qname无非是有着特定格式的xml元素,其作用主要是增加了名字空间,比如有同样的元素名称,而名字空间不同的情况。
自己测试:
// 指定名称空间 URI 和本地部分的 QName 构造方法。
// QName qn=new javax.xml.namespace.QName("http://tempuri.org/", "resultXML");
//指定名称空间 URI、本地部分和前缀的 QName 构造方法。
// QName qn=new javax.xml.namespace.QName("http://tempuri.org/", "resultXML","/");
//指定本地部分的 QName 构造方法。
QName qn=new javax.xml.namespace.QName("resultXML");
System.out.println("LocalPart:"+qn.getLocalPart());
System.out.println("Prefix:"+qn.getPrefix());
System.out.println("NameSapceUri:"+qn.getNamespaceURI());
仔细看下下面的东西: 我也是耐心了看了几遍才懂的。。。
4 Qualified Names
In XML documents conforming to this specification, some names (constructs corresponding to the nonterminalName)MUST be given as qualified names, defined as follows:
Qualified Name
[7] | | ::= | |
| |||
[8] | | ::= | |
[9] | | ::= | |
[10] | | ::= | |
[11] | | ::= | |
The Prefix provides thenamespace prefix part of the qualified name, andMUST be associated with a namespace URI reference in a namespace declaration. [Definition: TheLocalPart provides thelocal part of the qualified name.]
Note that the prefix functions only as a placeholder for a namespace name. ApplicationsSHOULD use the namespace name, not the prefix, in constructing names whose scope extends beyond the containing document.
5 Using Qualified Names
In XML documents conforming to this specification, element names are given asqualified names, as follows:
Element Names
[12] | | ::= | | [NSC: Prefix Declared] |
[13] | | ::= | | [NSC: Prefix Declared] |
[14] | | ::= | | [NSC: Prefix Declared] |
An example of a qualified name serving as an element name:
<!-- the 'price' element's namespace is http://ecommerce.example.org/schema -->
<edi:price xmlns:edi='http://ecommerce.example.org/schema' units='Euro'>32.18</edi:price>
Attributes are either namespace declarations or their names are given asqualified names:
Attribute
[15] | | ::= | |
| [NSC: Prefix Declared] | ||
[NSC: No Prefix Undeclaring] | |||
[NSC: Attributes Unique] |
An example of a qualified name serving as an attribute name:
<x xmlns:edi='http://ecommerce.example.org/schema'>
<!-- the 'taxClass' attribute's namespace is http://ecommerce.example.org/schema -->
<lineItem edi:taxClass="exempt">Baby food</lineItem>
</x>
JDK api文档里的跳转页面也有这些上面的资料 可以做去查下。。。。