xml 如何在 XQuery 中将字符串转换为节点？
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How do you convert a string to a node in XQuery?
提问by Sixty4Bit
I would like to convert a string into a node. I have a method that is defined to take a node, but the value I have is a string (it is hard coded). How do I turn that string into a node?
我想将字符串转换为节点。我有一个定义为获取节点的方法，但我拥有的值是一个字符串（它是硬编码的）。如何将该字符串转换为节点？
So, given an XQuery method:
所以，给定一个 XQuery 方法：
define function foo($bar as node()*) as node() {
(: unimportant details :)
}
I have a string that I want to pass to the foo method. How do I convert the string to a node so that the method will accept the string.
我有一个要传递给 foo 方法的字符串。如何将字符串转换为节点，以便该方法接受该字符串。
回答by Sixty4Bit
MarkLogic solutions:
MarkLogic 解决方案：
The best way to convert a string into a node is to use:
将字符串转换为节点的最佳方法是使用：
xdmp:unquote($string).
Conversely if you want to convert a node into a string you would use:
相反，如果要将节点转换为字符串，则可以使用：
xdmp:quote($node).
Language agnostic solutions:
语言不可知的解决方案：
Node to string is:
节点到字符串是：
fn:string($node)
回答by Sixty4Bit
If you want to create a textnode out of the string, just use a textnode constructor:
如果要从字符串中创建文本节点，只需使用文本节点构造函数：
text { "your string goes here" }
or if you prefer to create an elementwith the string content, you can construct an elementsomething like this:
或者如果你更喜欢用字符串内容创建一个元素，你可以构造一个像这样的元素：
element (some-element) { "your string goes here" }
回答by mb21
If you are talking about strings that contain XML markup, there are standardized solutions (from XPath/XQuery Functions 3.0) as well:
如果您谈论的是包含 XML 标记的字符串，那么也有标准化的解决方案（来自 XPath/XQuery Functions 3.0）：
- string to node: fn:parse-xml()
- node to string: fn:serialize()
- 字符串到节点：fn:parse-xml()
- 节点到字符串：fn:serialize()
回答by Jim Burger
The answer to this question depends on what engine is being used. For instance, users of Saxon, use the saxon:parsemethod.
这个问题的答案取决于所使用的引擎。例如，Saxon 的用户，使用该saxon:parse方法。
The fact is the XQueryspec doesn't have a built in for this.
事实是XQuery规范没有为此内置。
Generally speaking you would only really need to use this if you needed to pull some embedded XMLfrom a CDATAsection. Otherwise you can read files in from the filesystem, or declare XMLdirectly inline.
一般来说，如果您需要从CDATA部分提取一些嵌入的XML，您才真正需要使用它。否则，您可以从文件系统中读取文件，或直接内联声明XML。
For the most you would use the declarative form, instead of a hardcoded string e.g. (using Stylus studio)
大多数情况下，您会使用声明形式，而不是硬编码的字符串，例如（使用 Stylus Studio）
declare namespace my = "http://tempuri.org";
declare function my:foo($bar as node()*) as node() {
<unimportant></unimportant>
} ;
let $bar := <node><child></child></node>
return my:foo(bar)
