Returns the property of the variable

        Examples
        --------
        >>> reader = XMLBIF.XMLBIFReader("xmlbif_test.xml")
        >>> reader.get_property()
        {'bowel-problem': ['position = (190, 69)'],
         'dog-out': ['position = (155, 165)'],
         'family-out': ['position = (112, 69)'],
         'hear-bark': ['position = (154, 241)'],
         'light-on': ['position = (73, 165)']}

def get_property(self):
        """
        Returns the property of the variable

        Examples
        --------
        >>> reader = XMLBIF.XMLBIFReader("xmlbif_test.xml")
        >>> reader.get_property()
        {'bowel-problem': ['position = (190, 69)'],
         'dog-out': ['position = (155, 165)'],
         'family-out': ['position = (112, 69)'],
         'hear-bark': ['position = (154, 241)'],
         'light-on': ['position = (73, 165)']}
        """
        variable_property = {variable.find('NAME').text: [property.text for property in variable.findall('PROPERTY')]
                             for variable in self.network.findall('VARIABLE')}
        return variable_property