4.3 $DATA

Returns a numeric value 0, 1, 10, or 11, depending on whether a referenced node is defined, has data, or has children:

SET RESULT=$DATA(<node>)

The return values are as follows:

0: <node> is undefined
1: <node> has data but no children
10: <node> has children but no data
11: <node> has children and data

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