Azure 逻辑应用程序 - xpath 为 xml，带命名空间前缀

Question

In my logic app i am using xpath() function to get the value of. I have tried different xpaths but getting error

'The template language function 'xpath' parameters are invalid: the 'xpath' parameter must be a supported, well formed XPath expression. Please see https://aka.ms/logicexpressions#xpath for usage details.'.

i have the following xml:

I have tried:

@xpath(xml(<YourMessage>), '/*[local-name()=\"Envelope\" and namespace-uri()=\"http://schemas.xmlsoap.org/soap/envelope/\"]/*[local-name()=\"Body\" and namespace-uri()=\"http://schemas.xmlsoap.org/soap/envelope/\"]')
@xpath(xml(<YourMessage>), 'string(/*[local-name()=\"Envelope\" and namespace-uri()=\"http://schemas.xmlsoap.org/soap/envelope/\"]/*[local-name()=\"Body\" and namespace-uri()=\"http://schemas.xmlsoap.org/soap/envelope/\"])')

but getting the same error

Answer 1

您可以使用以下表达式在xpath中包括名称空间：

@xpath(YOURBODY, '/*[local-name()=\"Envelope\" and namespace-uri()=\"http://schemas.xmlsoap.org/soap/envelope/\"]/*[local-name()=\"Body\" and namespace-uri()=\"http://schemas.xmlsoap.org/soap/envelope/\"]')

Answer 2

我做了Johns-305的建议。

json(<Output>)['soap:Envelope']['soap:Body']

Answer 3

Coming to this late, but the error is because you've escaped the double-quotes in the designer (which automagically escapes double-quotes for you).

This is from the Reference guide to expression functions for Azure Logic Apps and Power Automate :

Important

If you work in code view, escape the double quotation mark ( " ) by using the backslash character ( \ ). For example, you need to use escape characters when you serialize an expression as a JSON string. However, if you're work in the Logic App Designer or expression editor, you don't need to escape the double quotation mark because the backslash character is added automatically to the underlying definition, for example:

Code view: xpath(xml(body('Http')), '/*[name()=\"file\"]/*[name()=\"location\"]')

Expression editor: xpath(xml(body('Http')), '/*[name()="file"]/*[name()="location"]')

Answer 4

You might be better off converting to JSON and working with the data in that format. At least you can get rid of all the silly namespace complexities that way.

LogicApps is JSON focused internally so doing so would be slightly more 'correct' anyway.

You can find samples at: JSONPath - XPath for JSON

And an evaluator: JSONPath Online Evaluator

Answer 5

If what you need is the value of one of the internal nodes, you can try:

@xpath(<YourMessage>, 'string(/*[local-name()=\"Envelope\" and namespace-uri()=\"http://schemas.xmlsoap.org/soap/envelope/\"]/*[local-name()=\"Body\" and namespace-uri()=\"http://schemas.xmlsoap.org/soap/envelope/\"]/*[name()=\"SearchByABNv201408Response\"]/*[name()=\"ABRPayloadSearchResults\"]/*[name()=\"Request\"]/*[name()=\"identifierSearchRequest\"]/*[name()=\"authenticationGUID\"])')

I hope this points you in the right direction