Constraints

R6 class with constraints.
The constraints property on Table Schema Fields can be used by consumers to list constraints for 
validating field values. For example, validating the data in a Tabular Data Resource against 
its Table Schema; or as a means to validate data being collected or updated via a data entry interface.
All constraints <code>MUST</code> be tested against the logical representation of data, and the physical 
representation of constraint values <code>MAY</code> be primitive types as possible in JSON, 
or represented as strings that are castable with the type and format rules of the field.

data

Allows to work with 'Table Schema' (<https://specs.frictionlessdata.io/table-schema/>). 'Table Schema' is well suited for use cases around handling and validating tabular data in text formats such as 'csv', but its utility extends well beyond this core usage, towards a range of applications where data benefits from a portable schema format. The 'tableschema.r' package can load and validate any table schema descriptor, allow the creation and modification of descriptors, expose methods for reading and streaming data that conforms to a 'Table Schema' via the 'Tabular Data Resource' abstraction.

Kleanthis Koupidis

tableschema.r

Table Schema 'Frictionless Data'

Lazaros Ioannidis

Charalampos Bratsas

Open Knowledge International 

Constraints function

Format

<dl>
<dt><code>constraints</code></dt>
<dd>see Section See Also</dd></dl>

Fields

Constraints class — Constraints

<dl>
<dt><code>constraints</code></dt>
<dd>see Section See Also</dd>


</dl>

Constraints: Constraints class

Description

Arguments

Value

Format

Fields

See Also