Regarding twin/triple siblings in XML

[mpsn]

Hi, I am converting XML to DB and was wondering is it bad XML structure to have twin siblings (or triplets or identical siblings in general), what I mean is:

 

eg:

<email>

  <to>

  <toFirstName>John</toFirstName>

  <toLastName type="common">Smith</toLastName>

  </to>

  <to>

  <toFirstName>Jack</toFirstName>

  <toLastName type="unique">Dravisone</toLastName>

</to>

</email>

 

Any help much appreciated!