def _get_projection(el):
result = None<EOL>if hasattr(el, '<STR_LIT>'):<EOL><INDENT>result = (int(el._auxiliary_component), el.crs)<EOL><DEDENT>return result<EOL>
Get coordinate reference system from non-auxiliary elements.
Return value is a tuple of a precedence integer and the projection,
to allow non-auxiliary components to take precedence.