How to map XML to RDF using RML where child id does not exist. Problem in rr:template of rr:subjectMap

[uttam1216]

Hi,
What can I write in {} of rr:template section of the RML rules, if I have no id for that particular branch(e.g. Addresse)?
I need to convert a XML to RDF , for which I am writing RML rules, but some of the child tags in my XML have no id and is also hierarchical. I know joining the parent with child, but child without an id is not being read currently, which is my issue.
e.g. of XML file that I have:
<ADT_GEKID>
<Menge_Patient>
<Patienten_Stammdaten Patient_ID="10791.0">
40642347
<Menge_Adresse>

<Patienten_Strasse>Hertrampfweg</Patienten_Strasse>
<Patienten_Hausnummer>87</Patienten_Hausnummer>

</Menge_Adresse>
</Patienten_Stammdaten>

</Menge_Patient>
<Menge_Melder>

<Meldende_Stelle>101250</Meldende_Stelle>

</Menge_Melder>
</ADT_GEKID>

Thanks.