[xml] xmlDocPtr to xml string

I want the way to convert xmlDocPtr to xml string. Actually I have to set some data inside a tag for e.g.
I have to insert 444 inside tag A in xml string. <AA><A></A></AA>
So I have created xml DocPtr from the xml string and then I have set the value 444 to that node. Now I have to extract the modified xml string.

Waiting for response.

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