line()

line() creates structural schema definitions.

Each line() function represents an entire line of the data file.

Using wildcards and blanks allows a line() to specify just certain headers, rather than explicitly defining header-by-header. This also allows for more line() functions to specify other structures within the same data. You could, for e.g., define a person line() and an address line() that lives side by side in the same rows.

Note that wildcard() and wildcard("*") are functionally the same.

Data signatures
line( [function representing a data type: $${\color{green}None}$$ ǁ $${\color{green}Any}$$], ... )

Call signatures
line( [function representing a data type: Wildcard ǁ String ǁ Boolean ǁ Decimal ǁ Date ǁ Nonef ǁ Blank ǁ Email ǁ Url], ... )

Purpose	Value
Main focus	line() determines if lines match

Context	Qualifier
Match qualifiers	onmatch, distinct
Name qualifier	optionally expected

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