如何从 R 对象创建 xml,例如,是否有“listToXml"函数? [英] How to create xml from R objects, e.g., is there a 'listToXml' function?
问题描述
R 的 XML 包有一个 xmlToList 函数,但是没有反向,是有一个 R 函数可以将列表转换为 XML 对象?
R's XML package has an xmlToList function, but does not have the reverse, is there a function for R that will convert a list to an XML object?
我想要类似的东西
listToXML(list('a'))
返回
<a></a>
但我能找到的最接近的是
but the closest I can find is
library(XML)
xmlNode(list('a'))
哪个返回
</a>
关于这个问题的帮助,以及理解 R 对象到 XML 的转换通常受到赞赏(XML 包似乎更侧重于使用 R 来读取 XML,对创建 XML 的支持较少).
help on this question, and understanding the conversion of R objects to XML in general appreciated (the XML package appears more focused on the use of R to read XML, with less support for creating XML).
更新... 我无法弄清楚这一点的一个原因是我没有意识到 <node/>
中的尾随 '/' 表示一个空节点,相当于
Update... One reason that I could not figure this out is because I did not realize that the trailing '/' in <node/>
indicates an empty node, equivalent to <node></node>
推荐答案
newXMLNode
函数可以完成您的需求,即编写 XML 输出.有关更多详细信息,请参阅 ?newXMLNode
中的详细帮助和示例.这是一个简短的摘录:
The function newXMLNode
does what you need, i.e., write XML output. See the detailed help and examples in ?newXMLNode
for more details. Here is a short extract:
library(XML)
top = newXMLNode("a")
newXMLNode("b", attrs=c(x=1, y='abc'), parent=top)
newXMLNode("c", "With some text", parent=top)
top
结果:
<a>
<b x="1" y="abc"/>
<c>With some text</c>
</a>
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