#### Extension

The Extension drop-down list becomes available when the item chosen in ID drop-down list requires the addition of an extension in order to form a usable expression element. The Extension drop-down list displays available extensions based on the item selected in the ID drop-down list.

Example: Suppose you select a feature from the ID drop-down list. The list of possible extensions that can be used to reference data of that feature (such as "X", "Y", "Z", "Diam", "Length", etc.) are then listed in the Extension drop-down list.

Possible extensions include these measured or theoretical data types:

- All – All the values of the feature are assigned to the variable. See the example below.

- X – Measured X values of the hits

- Y – Measured Y values of the hits

- Z – Measured Z values of the hits

- XYZ – Measured XYZ values of the hits

- I – Measured I values of the hits

- J – Measured J values of the hits

- K – Measured K values of the hits

- IJK – Measured IJK values of the hits

- TX – Theoretical X values of the hits

- TY – Theoretical Y values of the hits

- TZ – Theoretical Z values of the hits

- TXYZ – Theoretical XYZ values of the hits

- TI – Theoretical I values of the hits

- TJ – Theoretical J values of the hits

- TK – Theoretical K values of the hits

- TIJK – Theoretical IJK values of the hits

Example:

F1 =GENERIC/POINT,DEPENDENT,CARTESIAN,$

NOM/XYZ,<8,9,10>,$

MEAS/XYZ,<7.98,8.98,9.98>,$

NOM/IJK,<1,0,0>,$

MEAS/IJK,<1,0,0>

ASSIGN/MYFEATURE = F1.ALL

ASSIGN/V1 = MYFEATURE.X

ASSIGN/V2 = MYFEATURE.TX

V1 contains the value of 7.98

V2 contains the value of 8