XP1 Workshop on Relational Database Theory, 30 June - 2 July 1980, SUNY at Stony Brook, NY, USA. 1980 [contents]
XP2 Workshop on Relational Database Theory, June 22-24 1981, The Pennsylvania State University, PA, USA. 1981 [contents] XP4.5 Workshop on Database Theory, 1983 Palo Alto, California, USA. 1983 [contents] Henry F. Korth:
XP / 7.52 Workshop on Database Theory, University of Texas at Austin, TX, USA, August 13-15, 1986. 1986 [contents]
The numbering comes from the idea that the XP workshops were the seed for the founding of the PODS conference. By this logic, the first PODS was XP3, the second XP4, and thus, when an XP workshop was held in the summer of 83 (after the second PODS) the "right" numbering was XP 4.5. When another XP was held in 86 it had to be numbered between 7 and 8. Since it was held later in the summer than XP 4.5, it became XP 7.52.
Acknowledgement: Information about the XP Workshops was contributed by Henry F. Korth.