Parse the <loader> element of the domain capabilities.

def _parse_caps_loader(node):
    '''
    Parse the <loader> element of the domain capabilities.
    '''
    enums = [_parse_caps_enum(enum) for enum in node.findall('enum')]
    result = {item[0]: item[1] for item in enums if item[0]}

    values = [child.text for child in node.findall('value')]

    if values:
        result['values'] = values

    return result