A sequence can contain any type, including other sequences, but each element in a sequence must be of the same type (sequences are homogeneous). The type of a sequence whose elements are of type , is specified as [ ]. For examples:
Sequences of characters can be written between double quotes,
Empty sequences must be explicitly typed since the type cannot be determined from the elements. The type of an empty sequences is specified by using empty square braces followed by the type of the elements. For example,
Appendix B.2 describes the functions that operate on sequences.