Hierarchical databases and semistructured data

Hi. I'm trying to find out when semistructured data became a research topic. The oldest articles I've run into, are on TSIMMIS from 1994.

Am I correct when I assume that this is a relatively new topic that, despite similarities in model, have nothing to do with hierarchical databases. I assume this as the latter has a strict notion of schemas. If I'm incorrect, pointers to tutorials on the subject are greatly appreciated.

Thanks you,

Morten Received on Wed Feb 20 2002 - 09:43:03 CST