Frictionless Table Schema (LinkML representation)

LinkML representation of the Frictionless Table Schema specification (https://specs.frictionlessdata.io/table-schema/), as consumed by the schema-automator Frictionless adapter. Covers the column-descriptor layer of a Frictionless data package (the schema block), not the surrounding data-package metadata. Used as the source schema for linkml-map trans-specs that translate to the canonical data dictionary format.

URI: https://specs.frictionlessdata.io/table-schema

Name: frictionless_table_schema

Classes

Class	Description
Constraints	Validation constraints attached to a field
Field	Descriptor for a single column of the tabular resource
ForeignKey	Foreign-key constraint linking field(s) in this resource to field(s) in anoth…
ForeignKeyReference	The target side of a foreign-key constraint
TableSchema	A Frictionless Table Schema document — the column descriptors for a single ta…

Slots

Slot	Description
constraints	Validation constraints on field values
description	Markdown-flavored description of what the field represents
enum	Closed list of allowed values
example	Example value for the field, useful for human readers and some tools
fields	Ordered list of field (column) descriptors
foreignKeys	Foreign key constraints linking fields in this resource to fields in another …
format	Format refinement of the field type
maximum	Maximum permissible value (matches minimum semantics)
maxLength	Maximum length for string values (or item count for arrays)
minimum	Minimum permissible value for numeric, date, datetime, time, year, and yearmo…
minLength	Minimum length for string values (or item count for arrays)
missingValues	String values to interpret as missing data when reading the tabular resource
name	Machine-readable name of the field
pattern	Regular expression that all values must match (XML Schema regex syntax)
primaryKey	Field name(s) that together identify each row
rdfType	URI or CURIE naming a class in a controlled vocabulary that this field’s valu…
reference	The target of the reference
required	Whether the field must have a value in every row
resource	Name of the resource being referenced
title	Human-readable title for the field
type	Logical type of values in the field
unique	Whether each value of this field must be distinct across rows

Enumerations

Enumeration	Description
FrictionlessType	The Frictionless Table Schema type vocabulary (https://specs

Types

Type	Description
Boolean	A binary (true or false) value
Curie	a compact URI
Date	a date (year, month and day) in an idealized calendar
DateOrDatetime	Either a date or a datetime
Datetime	The combination of a date and time
Decimal	A real number with arbitrary precision that conforms to the xsd:decimal speci…
Double	A real number that conforms to the xsd:double specification
Float	A real number that conforms to the xsd:float specification
Integer	An integer
Jsonpath	A string encoding a JSON Path
Jsonpointer	A string encoding a JSON Pointer
Ncname	Prefix part of CURIE
Nodeidentifier	A URI, CURIE or BNODE that represents a node in a model
Objectidentifier	A URI or CURIE that represents an object in the model
Sparqlpath	A string encoding a SPARQL Property Path
String	A character string
Time	A time object represents a (local) time of day, independent of any particular…
Uri	a complete URI
Uriorcurie	a URI or a CURIE

Subsets

Subset	Description