Range Selection

A range in a beam line is selected by the following syntax:

range ::= place |
          place "/" place

This denotes the range of elements from the firstplace to the second place. Both positions are included. A few special cases are worth noting:

• When place1 refers to a LINE. the range starts at the beginning of this line.
• When place2 refers to a LINE. the range ends at the ending of this line.
• When both place specifications refer to the same object, then the second can be omitted. In this case, and if place refers to a LINE the range contains the whole of the line.

Examples: Assume the following definitions:

M: MARKER;
S: LINE=(C,M,D);
L: LINE=(A,M,B,2*S,A,M,B);

The line L is equivalent to the sequence of elements

A,M,B,C,M,D,C,M,D,A,M,B

Examples for range selections:

#S/#E

The full range or L.

A[1]/A[2]

A[1] through A[2], both included.

S::M/S[2]::M

From the marker M nested in the first occurrence of S, to the marker M nested in the second occurrence of S.

S[1]/S[2]

Entrance of first occurrence of S through exit of second occurrence of S.