Constraints that must be simultaneously true of a region are expressed
by separating the constraint expressions with commas. The region set
matched by
*S _{1}, S_{2}, ..., S_{n}*
is the intersection of the
region sets matched by each

Alternative constraints are specified by separating the constraint
expressions with ``*|*''. The region set
matched by
*S _{1} | S_{2} | ... | S_{n}*
is the
union of the region sets matched by each

Robert C. Miller and Brad A. Myers

Mon Apr 26 11:34:19 EDT 1999