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Let us build as an example a circular inclusion between two plates.  We will simply treat the plates as the top and bottom surfaces of a square enclosure, with the circle centered between them.  Using the statements above and adding the required control labels, we get:

BOUNDARIES

REGION 1 'box'        { the bounding box }

START(-1,-1)

LINE TO(1,-1)

TO (1,1)

TO (-1,1)

TO CLOSE

REGION 2 'blob'        { the embedded circular 'blob' }

START 'ring' (1/2,0)

ARC(CENTER=0,0) ANGLE=360 TO CLOSE

 

The resulting figure displayed by the "domain review" button is this:

 

 

 

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Note: The detailed Rules for constructing domain boundaries is included in the Reference chapter "Sections | Boundaries".