Primitive Types

COGS has 25 case-sensitive primitive names. Model types cannot shadow them. dcTerms is a source macro, not a runtime primitive; This and Any are retired.

The complete value-domain and wire table is in Model Format. Native language mappings and migration examples are in Native types and migration.

The shared profile keeps ordinary JavaScript JSON interchange practical:

• int remains signed 32-bit. Other integer families use the JavaScript safe-integer interval intersected with their sign restrictions. Cardinalities remain arbitrary-size nonnegative integers.

• decimal must be exact in System.Decimal and survive JSON.stringify with the same mathematical decimal value. Ineligible values are rejected.

• float uses binary32 rounding; double uses binary64. Nonfinite values are invalid, and zero has one canonical positive form.

• dateTime requires a timezone and whole milliseconds; output is UTC. date is local, without timezone, in years 0001–9999. time is local without timezone, at microsecond precision.

• duration is elapsed whole milliseconds, with no years/months.

• Partial Gregorian values, cogsDate and langString retain their structured information. Text must be XML-compatible Unicode.

Facets

Facets constrain each value, not a repeated property’s array. Length counts Unicode scalar values, so a supplementary character counts as one.

Enumeration is a whitespace-delimited list in one CSV cell. Blank means no enumeration. For example, small medium large declares three values. Values cannot contain whitespace; there is no internal quoting or escaping. Order and casing are preserved. JSON-looking text is split by the same rule. Numeric and temporal enumeration compares values, so equivalent spellings are not separate choices. Exact identification values are never normalized.

Patterns use substring matching and the portable subset in the specification: literals, dot, simple classes, capturing groups, alternation, and ordinary greedy quantifiers. Anchors, lookarounds, backreferences, special groups, flags, shorthand classes, Unicode categories, nested classes, class subtraction and lazy quantifiers are rejected. Dot excludes the four standard line terminators. Escapes cover metacharacters, tab, newline and carriage return.

Use validate-instance for authoritative validation. Standard schemas alone do not implement every native-domain or value-comparison constraint.