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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def process_xml(xml_string):
 """Return a TripsProcessor by processing a TRIPS EKB XML string. Parameters xml_string : str A TRIPS extraction knowledge base (EKB) string to be processed. http://trips.ihmc.us/parser/api.html Returns ------- tp : TripsProcessor A TripsProcessor containing the extracted INDRA Statements in tp.statements. """

    tp = TripsProcessor(xml_string)
    if tp.tree is None:
        return None
    tp.get_modifications_indirect()
    tp.get_activations_causal()
    tp.get_activations_stimulate()
    tp.get_complexes()
    tp.get_modifications()
    tp.get_active_forms()
    tp.get_active_forms_state()
    tp.get_activations()
    tp.get_translocation()
    tp.get_regulate_amounts()
    tp.get_degradations()
    tp.get_syntheses()
    tp.get_conversions()
    tp.get_simple_increase_decrease()
    return tp