🐛 Need to clarify if `required` means a required column OR also required valid data within column

[e-lo]

As an implementer of GMNS, I'd like to understand if the required constraint applies to values or columns (or both)

Frictionless spec is really just checking for the column presence and allows for missing values. If we don't want missing values, then we need to assert pattern or enum or other constraints.

[ianberg-volpe]

Our intent was to use the term required to require column presence and prohibit missing values. I think this lines up with the definition used by Frictionless Table Schema's constraints:

Property	Type	Applies to	Description
required	boolean	All	Indicates whether this field cannot be null. If required is false (the default), then null is allowed. See the section on missingValues for how, in the physical representation of the data, strings can represent null values.

Is the issue actually in the frictionless python package's implementation of the term?