The createRequestersRequest type does not allow mixed content.
There is no restriction on type derivation.
XML Instance
<...>
List of requester definitions to create. Each definition has a definition
type that indicates whether an entry in the list describes an individual requester
or a requester group. The parent group is mandatory for each entry in the list
during creation.
<xhtml:p>List of requester definitions to create. Each definition has a definition
type that indicates whether an entry in the list describes an individual requester
or a requester group. The parent group is mandatory for each entry in the list
during creation.</xhtml:p>