[xml] clarification about "empty" text nodes

I got a function, which gets a node and reads the content of it. The
problem is, that in some cases it might be a node, that has no text. In
that case I get the whole tree as formated text, because libxml2 stores
such formatting chars in the "empty" text nodes. And because that
content of the text nodes isn't empty I can just verify an empty text
node, when I check the first char of "content" for 0x0a. Is that right?

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