Number of characters in document

Question: How do I (inside the XSL stylesheet) get the number of characters
in the whole XML document (or in a specific node)?

for example, if the XML document is:
<A>
	<B>
		<C>1</C>
	</B>
	<B>
		<C>1</C>
		<C>2</C>
	</B>
</A>

the number of characters in node A would be the length of the string
"<A><B><C>1</C></B><B><C>1</C><C>2</C></B></A>"


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