RelaxNG中的控件属性值顺序 [英] Control attribute values order in RelaxNG
本文介绍了RelaxNG中的控件属性值顺序的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
能否在Relax NG中控制属性值的顺序?可以在模式中使用xs:assert来实现?
Is it possible to control the order of the attribute values in Relax NG? which can be achieved using xs:assert in schema?
XML:
<body>
<h1 class="title">title</h1>
<h2 class="subtitle">subtitle</h2>
<p class="paragraph1">para text 1</p>
<p class="paragraph2">Para text 2</p>
<p class="paragraph3">Para text 2</p>
</body>
类值应按顺序排列，第1段应始终排在第一位，第2段应在第1段后.我在模式中尝试过的断言:
The class value should be in order, paragraph1 should always come first and paragraph2 should come after paragraph1. The assert I tried in schema:
<xs:assert test="p[1]/@class = 'paragraph1'
and ((every $i in p[2] satisfies $i/@class = 'paragraph2')
and (every $i in p[3] satisfies $i/@class = 'paragraph3')) "/>
推荐答案
表示问题描述内容的一种(紧凑语法)RelaxNG语法可以写为:
A (compact-syntax) RelaxNG grammar to express what the question describes could be written as:
start = element body { h1?, h2?, p.paragraph1?, p.paragraph2?, p.paragraph3? }
h1 = element h1 { text & attribute class { string } }
h2 = element h2 { text & attribute class { string } }
p.paragraph1 = element p { text & attribute class { string "paragraph1" } }
p.paragraph2 = element p { text & attribute class { string "paragraph2" } }
p.paragraph3 = element p { text & attribute class { string "paragraph3" } }
以RelaxNG XML语法表示:
Expressed in the RelaxNG XML syntax:
<grammar xmlns="http://relaxng.org/ns/structure/1.0" datatypeLibrary="">
<start>
<element name="body">
<optional>
<ref name="h1"/>
</optional>
<optional>
<ref name="h2"/>
</optional>
<optional>
<ref name="p.paragraph1"/>
</optional>
<optional>
<ref name="p.paragraph2"/>
</optional>
<optional>
<ref name="p.paragraph3"/>
</optional>
</element>
</start>
<define name="h1">
<element name="h1">
<interleave>
<text/>
<attribute name="class">
<data type="string"/>
</attribute>
</interleave>
</element>
</define>
<define name="h2">
<element name="h2">
<interleave>
<text/>
<attribute name="class">
<data type="string"/>
</attribute>
</interleave>
</element>
</define>
<define name="p.paragraph1">
<element name="p">
<interleave>
<text/>
<attribute name="class">
<value type="string">paragraph1</value>
</attribute>
</interleave>
</element>
</define>
<define name="p.paragraph2">
<element name="p">
<interleave>
<text/>
<attribute name="class">
<value type="string">paragraph2</value>
</attribute>
</interleave>
</element>
</define>
<define name="p.paragraph3">
<element name="p">
<interleave>
<text/>
<attribute name="class">
<value type="string">paragraph3</value>
</attribute>
</interleave>
</element>
</define>
</grammar>
这篇关于RelaxNG中的控件属性值顺序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
