property_columns

Definition

Columns published as typed object attributes: {column: {attribute, type, unit_column, unit}}.

Decide what an attribute means

For each property column, identify its business attribute, value type and unit. For example, an exported value of 120 needs a unit: a currency, a count or another measure. Preserve the distinction between the source column name and the published attribute name.

Prepare the declaration

1. Read the physical column header and representative values, including missing values.
2. Choose the attribute and type supported by the selected contract.
3. Decide whether the unit comes from another column through unit_column or is explicitly declared with unit.
4. Validate the source and inspect the published attribute for a known object.

The structure shown in the definition is a key outline, not a complete typed example. Use the package's contract definitions for the allowed type values.