And type is a combination of multiple types

Boolean value either true or false

Blob of raw binary data in base64url encoding as specified by RFC 4648

BuildVar is string macro from "xeto-build.props" injected at build time

Open enumerated taxonomy of marker tags

Collection is base type for all non-scalar types

ISO 8601 date as year, month, day

ISO 8601 timestamp followed by timezone identifier

Associative array of name/value pairs

Number with a unit of time

Top-level dicts with a unique identifier

Closed enumerated set of string values

Err represents an error condition

Entity that represents a file containing textual or binary data

Filter query string

Unitless floating point number

Function represents the signature of a computation with zero or more parameter types and one return type

Collection of all functions in the namespace

Two dimension table of columns and rows - see Grids

Unitless integer number

Interface is an object oriented API defined as set of named field and method slots

Library module meta data - see Libs

Library dependency

Version constraints for a library dependency

Path used to select files from a lib's source directory for packaging

Publication maturity of a library version as claimed by its author

Organization library metadata - see Libs

Version control library metadata

Ordered list of zero or more values

Marker labels a dict with typing information

Reference or list of references

Not available indicates invalid or missing data

None represents the absense of value

Number is an integer or floating point value with an optional unit of measurement

Root type for all objects

Or type is a choice between one of multiple types

Query defines a named data set

Reference to another dict

Scalar is an atomic value kind with a string encoding

Span models a time range between two DateTimes

Relative span to current date

Spec models a type specification and the metadata slots

Unicode string of characters

This is a placeholder that always represents the parent type

ISO 8601 time as hour, minute, seconds

TimeZone names for standardized database

Unit symbols for standardized database

Unit quantity types for standardized database

Universal resource identifier

ValidateItem models one diagnostic reported by validation

Diagnostic level for a validation rule

ValidateRule defines one validation diagnostic registered on the types it applies to

Version string formatted as decimal digits separated by a dot