Product:	MicroStation
	Version:	08.11.09.459
	Environment:	N\A
	Area:	Configuration
	Subarea:	Workspaces

Problem

What is the difference between the various preprocessor directives?

Solution

=	Assign new_value to VARIABLENAME
:	Assign new_value to VARIABLENAME only if that variable does not already exist.
+	Append new_value to current value of VARIABLENAME. Uses a space as a separator.
>	Append directory or file lists defined by new_value to a variable definition that defines a path. If no current value for VARIABLENAME exists, this is equivalent to the = operator. Otherwise, it appends a path separator character, a semicolon (;), and then new_value.
<	"Prepend" directory or file lists defined by new_value (to the beginning of) a variable definition that defines a path. If no current value for VARIABLENAME exists, this is equivalent to the = operator. Otherwise, it prepends new_value followed by a path separator character, a semicolon (;).

See Also

http://communities.bentley.com/communities/other_communities/askinga/w/askinga/preprocessor-directives-for-processing-configuration-files.aspx

Other language sources

Deutsch

Original Author:

Bentley Technical Support Group