Document processing in a relational database system
Michael R Stonebraker, Heidi Stettner, Nadene Lynn, Joseph Kalash, Antonin Guttman · ACM Transactions on Information Systems · 1983
This paper contains a proposal to enhance a relational database manager to support document processing.Basically, it suggests support for data items that are variable-length strings, support for ordered relations, support for substring operations, and support for new operators that concatenate and break apart string fields.