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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 _getAdmlPresentationRefId(adml_data, ref_id):
    '''
    helper function to check for a presentation label for a policy element
    '''
    search_results = adml_data.xpath('//*[@*[local-name() = "refId"] = "{0}"]'.format(ref_id))
    prepended_text = ''
    if search_results:
        for result in search_results:
            the_localname = etree.QName(result.tag).localname
            presentation_element = PRESENTATION_ANCESTOR_XPATH(result)
            if presentation_element:
                presentation_element = presentation_element[0]
                if TEXT_ELEMENT_XPATH(presentation_element):
                    for p_item in presentation_element.getchildren():
                        if p_item == result:
                            break
                        else:
                            if etree.QName(p_item.tag).localname == 'text':
                                if prepended_text:
                                    prepended_text = ' '.join((text for text in (prepended_text, getattr(p_item, 'text', '').rstrip()) if text))
                                else:
                                    prepended_text = getattr(p_item, 'text', '').rstrip()
                            else:
                                prepended_text = ''
                    if prepended_text.endswith('.'):
                        prepended_text = ''
            if the_localname == 'textBox' \
                    or the_localname == 'comboBox':
                label_items = result.xpath('.//*[local-name() = "label"]')
                for label_item in label_items:
                    if label_item.text:
                        return (prepended_text + ' ' + label_item.text.rstrip().rstrip(':')).lstrip()
            elif the_localname == 'decimalTextBox' \
                    or the_localname == 'longDecimalTextBox' \
                    or the_localname == 'dropdownList' \
                    or the_localname == 'listBox' \
                    or the_localname == 'checkBox' \
                    or the_localname == 'text' \
                    or the_localname == 'multiTextBox':
                if result.text:
                    return (prepended_text + ' ' + result.text.rstrip().rstrip(':')).lstrip()
    return None