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12 changes: 12 additions & 0 deletions doc/std/VO-DML.md
Original file line number Diff line number Diff line change
Expand Up @@ -2718,6 +2718,10 @@ Represents a point in time. Will generally need time frame and units in
the serialization. Can also be used for **Attributes** just needing a
time without a date part and vice versa.

## duration

Represents a period of time in UTC timescale in a topocentric coordinate frame. Any string serialization to conform to ISO 8601.

## string

A standard string type, consisting of zero or more characters. We define
Expand All @@ -2729,6 +2733,14 @@ characters (as in VOTable for example).
A special subtype of string representing uniform resource
identifiers[^37]. Inspired by XML-Schema\'s anyURI[^38] type.

## ivoid extends anyURI

A special subtype of anyURI that represents an identifier that can be used as a key to look up in an IVOA registry - see https://www.ivoa.net/documents/IVOAIdentifiers/.

## uuid

A Universally Unique Identifier (UUID) is a 128-bit label used to uniquely identify objects in computer systems. The string serialization follows RFC 9562.

## Unit extends string

A string representing a unit following the IVOA specification in \[27\]
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