Xerox 701P21091 manual Using logical processing

Using logical processing

Character types

Masked comparisons using default type assignments

–Compare the character in that position for absolute equality.

–Ignore the character in that position (consider the character, whatever it is, to compare as equal).

–Compare the character in that position for type, for example, alphabetic, numeric, or some specially defined type.

An attribute called type may be associated with any character or characters in a character set. The possible types are identified by the integers 1 through 7. Any single character in a set, for example (\), either has a type (type 1, type 2, type 3, and so forth) or it does not. If a character has no type, it is referred to as “untyped.” It is possible for any character to be untyped, to have one type, or to have multiple types (for example, to be type 2 and type 3).

For every standard character set, there is a set of standard default type assignments which, for most applications, is sufficient without modification. These assignments are defined as follows:

•The numeric characters 0 through 9 are type 1 characters

•The uppercase and lowercase alphabetic characters A through Z and a through z are type 2 characters.

Use of these default type assignments can be invoked by the VOLUME TCODE command.

The defining of types, that is, the associating of type numbers with any group of characters in a character set, is described in the “TCODE command” section of the “Specifying input parameters” chapter.

Performing masked comparisons using unmodified standard default type assignments requires coding the following:

•TCODE parameter of the VOLUME command: Allows you to select a set of standard default type assignments.

•MASK and CONSTANT parameters of one or more occurrences of the TABLE command: Together, these parameters define exactly how the comparisons for that TABLE command are made using the set of type assignments specified by the TCODE parameter of the VOLUME command.

3-12 Using LCDS Print Description Language