如何使用Nokogiri Builder创建带有命名空间根元素的XML文档 [英] How to create an XML document with a namespaced root element with Nokogiri Builder

问题描述

我正在为需要名称空间的XML数据实现导出器.我正在使用Nokogiri的XML Builder(版本1.4.0)来执行此操作，但是，我无法让Nokogiri创建带有名称空间的根节点.

I'm implementing an exporter for XML data that requires namespaces. I'm using Nokogiri's XML Builder (version 1.4.0) to do this, however, I can't get Nokogiri to create a root node with a namespace.

这有效:

Nokogiri::XML::Builder.new { |xml| xml.root('xmlns:foobar' => 'my-ns-url') }.to_xml

<?xml version="1.0"?>
<root xmlns:foobar="my-ns-url"/>

是这样的:

Nokogiri::XML::Builder.new do |xml| 
  xml.root('xmlns:foobar' => 'my-ns-url') { xml['foobar'].child }
end.to_xml

<?xml version="1.0"?>
<root xmlns:foobar="my-ns-url">
  <foobar:child/>
</root>

但是，我需要类似<foo:root>的东西，但这不起作用:

However, I need something like <foo:root> and this doesn't work:

Nokogiri::XML::Builder.new { |xml| xml['foobar'].root('xmlns:foobar' => 'my-ns-url') }.to_xml

NoMethodError: undefined method `namespace_definitions' for #<Nokogiri::XML::Document:0x11bfef8 name="document">

显然，必须在使用前定义名称空间，因此无法将其添加到根节点.

Namespaces have to be defined before use, apparently, so there's no way to add one to the root node.

我发现"

I found "Define root node with a namespace?" on the Nokogiri mailing list, but it had no replies.

有人可以解决吗?

推荐答案

require 'rubygems'
require 'nokogiri'

puts Nokogiri::XML::Builder.new { |xml| 
  xml.root("xmlns:foo"=>"url") {
    xml.parent.namespace = xml.parent.namespace_definitions.find{|ns|ns.prefix=="foo"}
    xml['foo'].child
  }
}.to_xml

在定义名称空间(即I.E.)之前​​，不能使用xml['foo'].在将其作为参数传递给根节点之前，上面的代码事后将名称空间添加到了根节点.

You cannot use xml['foo'] before the namespace is defined, I.E. before you pass it as an argument to the root node, thus, the code above added the namespace after-the-fact to the root node.

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