Added one regression test

Removed warnings in the code.

Added comparison between different representations of float values in the case of complex type with simple content.

NB: it does not work with complex types containing simple content of type float, like this:
	<complexType name="item_t">
		<simpleContent>
			<extension base="float">
				<attribute name="foo" type="float"/>
				<attribute name="bar" type="integer"/>
			</extension>
		</simpleContent>
	</complexType>