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Table 3: Nine cardinal directional relations, where a, b are two bounded plane regions.
"... In PAGE 3: ... Similarly, if a is neither north nor south of b,thenwe say a is in y-contact with b, written as aCyb. The Boolean algebra generated by N,S,W,E, written as DIR9, has nine atoms (see Table3 ). Although it is very sim- ple, DIR9 is sufficient for expressing directional information in many situations.... ..."
Table Cardinalities
Table. 2. Mapping cardinality examples Cardinality
Table 5. Database cardinalities
"... In PAGE 16: ...ig. 23. Pointer-based joins with direct mapping contain references to objects in S. The cardinalities of the two tables are shown in Table5 . In the first set of analyses, we investigated functional joins along single-valued refer- ence attributes; in this case, jSrefSetj was fixed at 1.... ..."
Table 5 Database Cardinalities
"... In PAGE 18: ....1.5 Test Database and Test Queries Unless stated oth- erwise, the analyses are based on a simple database with tables R and S which we have been using in our examples throughout this paper; that is, the objects in R contain references to objects in S. The cardinalities of the two tables are shown in Table5 . In the rst set of analyses we investigated functional joins along single-valued refer- ence attributes; in this case, jSrefSetj was xed at 1.... ..."
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