Dear Professor, These days, most of the ETD repositories are being maintained using OAI-PMH compliant digital library software like Eprints.org or DSpace. OAI-PMH protocol (https://www.openarchives.org/pmh/) facilitates interoperability through metadata exchange. So, to create an union catalogue of ETDs, all that one needs to do is to set up a metadata harvesting service using software like Open Harvester Systems (https://pkp.sfu.ca/ohs/), identify the ETD repositories' OAI interface, and start harvesting the metadata from the repositories. First harvest will be a full harvest, and subsequent ones will be just incremental harvests.
With regards, Francis
JRD Tata Memorial Library
IISc
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From: LIS-Forum