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Yes, the dtds for the collections listed in IndexCat™ are available at:

Index-Catalogue collection dtd -  https://www.nlm.nih.gov/databases/dtd/nlmindexcataloguerecordset_130401.dtd

eTKeVK2 collection dtd - https://www.nlm.nih.gov/databases/dtd/nlmetkevk2recordset_130401.dtd