Method namespace_uri_predicate

UnitTests/TestApp/pugixml.cpp:7213–7219

	size_t prefix_length;

	namespace_uri_predicate(const char_t* name)
	{
		const char_t* pos = find_char(name, ':');

		prefix = pos ? name : 0;
		prefix_length = pos ? static_cast<size_t>(pos - name) : 0;
	}

	bool operator()(const xml_attribute& a) const
	{