<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_projection(el):
 """ 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. """

    result = None
    if hasattr(el, 'crs'):
        result = (int(el._auxiliary_component), el.crs)
    return result