Captures the first line a value or set of values is seen on.
first() stores the first line in a variable using the concatenation of
the values seen as the tracking value.
first() can use a name qualifier as its variable name; otherwise, the
variable name is "first".
| Data signatures |
| first( header to track: $${\color{green}Any}$$, ... ) |
| Call signatures |
| first( header to track: Header, ... ) |
| Purpose |
Value |
| Main focus |
first() produces a calculated value |
| Context |
Qualifier |
| Match qualifiers |
onmatch |
| Value qualifiers |
onmatch |
| Name qualifier |
optionally expected |
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