使用 XOM 编写 GraphML？

发布于 2024-08-11 18:59:58 字数 779 浏览 6 评论 0原文

我正在尝试用 java 中的 XOM 编写 graphML 文档，但我不知道如何使所有名称空间声明正确。为了拥有有效的 graphML，我需要有一个如下所示的根元素：

<graphml xmlns="http://graphml.graphdrawing.org/xmlns"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns
     http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">

我已经能够通过执行以下操作来获得大部分内容

Element root = new Element("graphml");
root.setNamespaceURI("http://graphml.graphdrawing.org/xmlns");
root.addNamespaceDeclaration("xsi", "http://www.w3.org/2001/XMLSchema-instance");

问题是该标签的最后一个元素，xsi:schemaLocation。我不知道如何在 XOM 中表达这一点。我不能将其作为普通属性来执行，因为这会引发异常（必须声明属性前缀。），并且将其作为附加命名空间声明也会导致异常（NCNames 不能包含冒号）。有什么想法吗？

原文

I'm trying to write out a graphML document with XOM in java, but I can't figure out how to get all of the namespace declarations correct. To have valid graphML, I need to have a root element that looks like the following:

<graphml xmlns="http://graphml.graphdrawing.org/xmlns"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns
     http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">

I've been able to get most of this by doing

Element root = new Element("graphml");
root.setNamespaceURI("http://graphml.graphdrawing.org/xmlns");
root.addNamespaceDeclaration("xsi", "http://www.w3.org/2001/XMLSchema-instance");

The problem is the last element of this tag, the xsi:schemaLocation. I can't figure out how to express this in XOM. I can't do it as a normal attribute, as that throws an exception(Attribute prefixes must be declared.) and doing it as an additional namespace declaration also results in an exception(NCNames cannot contain colons). Any ideas?

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你好，陌生人 2024-08-18 18:59:58

这应该可以做到。基本上，您没有为 xsi:schemaLocation 属性提供命名空间 URI。因此，尝试创建一个没有命名空间的前缀属性显然是行不通的。

root.addAttribute(new Attribute("xsi:schemaLocation",
    "http://www.w3.org/2001/XMLSchema-instance",
    "http://graphml.graphdrawing.org/xmlns http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd"));

在此处检查正确的属性构造函数

属性（字符串名称、字符串 URI、字符串值）

This should do it. Basically you didn't provide the namespace URI for xsi:schemaLocation attribute. Thus trying to create a prefixed attribute with no namespace which clearly won't work.

root.addAttribute(new Attribute("xsi:schemaLocation",
    "http://www.w3.org/2001/XMLSchema-instance",
    "http://graphml.graphdrawing.org/xmlns http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd"));

Check here for the correct Attribute constructor

Attribute(String name, String URI, String value)

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