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In one-dimensional domains, the concept that a REGION bounds a finite area by closing on itself is no longer true.  In one dimension, it is sufficient to define a path from the start of a material region to its finish.  (Referencing CLOSE in a 1D bounding path will cause serious troubles, because the path will retrace itself.)

 

For example, the statements

 

REGION 1

START(0) LINE TO (5)

 

are sufficient to define a region of material extending from location 0 to location 5 in the 1D coordinate system.

 

In order to maintain grammatical consistency with two- and three- dimensional constructs, omitting the parentheses is not permitted.

 

Other general characteristics of REGIONS remain in force in one-dimensional domains:

Later REGIONS overlay earlier REGIONS, material properties are defined following the REGION keyword, and so forth.