Add book dtd to elsevier ns dict.
Add book dtd to elsevier ns dict.

pvtodorov/indra,bgyori/indra,bgyori/indra,sorgerlab/belpy,bgyori/indra,sorgerlab/belpy,pvtodorov/indra,sorgerlab/indra,sorgerlab/indra,pvtodorov/indra,pvtodorov/indra,johnbachman/belpy,sorgerlab/belpy,johnbachman/indra,sorgerlab/indra,johnbachman/belpy,johnbachman/indra,johnbachman/belpy,johnbachman/indra