Xerox 701P21091 manual Constant Definition Example, Ascii

		PDL principles and procedures
	Table 1-2. Types of string constants
Constant	Definition	Example
Hexadecimal	Normally used as string constants,	IDEN PREFIX=X'C1C2C3C4';
	but they may also be used as
	value constants. Each pair of
	hexadecimal characters results in
	one byte. A hexadecimal constant
	must immediately be preceded by
	the characters X apostrophe (X’),
	then followed by another
	apostrophe, to indicate to the PDL
	compiler that the expression that
	follows is in hexadecimal.
ASCII	Used as string constants. Each	IDEN PREFIX=A'ABC!44EF'
	character results in one byte. The	is equivalent to
	constants must be preceded by	IDEN PREFIX=X'414243444546'
	the characters A apostrophe (A’)
	and followed by an apostrophe
	character.
	The ASCII string type allows
	hexadecimal representation of
	characters to be embedded in a
	string. This is done by preceding
	the hexadecimal representation of
	the character with an ! character.
	The three character sequence
	required for the hexadecimal
	representation of a character
	results in one byte.
	Two successive ! characters (!!)
	are necessary to represent one
	actual ! character when printing.
	The two character sequence (!!)
	results in one byte.

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