The 'Subject' Datatype
This document describes the XML datatype, i.e. lexical-to-value mapping,
identified by the URI "
Lexical scope: Any string or byte sequence in one of the formats listed below.
Value scope: Anything that can be described by those formats.
This datatype is implied by the "
x-rdf-subject:" URI prefix, or "
#" + (optional fragment ID) URI suffixes.
In some contexts (such when implied by URI with a fragment part,
or when using TOGVM's DataInterpretation/InterpretData expression/function),
a fragment identifier can be provided.
Primarily intended to support:
- Value is the object described by the root element, or element with rdf:ID if a fragment is given.
- TOGoS Binary Blocks (header: "TBB" + (char)0x81)
- Value is the subject of TBB document.
- TOGoS Text Blocks (header: "#TTB " + datatype URI)
- Value is the subject of TTB document.
- JSON-LD files
- Value is the object described by the root JSON-LD object,
or, if a fragment is indicated, the object with that ID described by the document.
But additionally, the following may be useful within certain applications:
- Image files, including "#COMPOUND-IMAGE" as used by PicGrid
- Value is the encoded image, which has a width, height, resolution, and some representation of
intensity for each channel
- Audio files, including "#SGTA"
- Value is the encoded MCAS (multi-channel analog signal),
which has a length, bitrate, and a mapping of time -> numeric value for each channel
- M3U files ("#EXTM3U")
- Value is a list of resources, with metadata
- TEF files ("#TEF")
- Value is the subject of TEF file.
If a fragment identifier is provided, it maps exactly to an entry's ID string.
The file or identified fragment must include a header with RDF-mapping
information for this to be well defined.
Examples of formats whose lexical-to-value mapping is *not* defined by this format:
- Generic JSON documents, i.e. those that are not JSON-LD and do not otherwise contain
an explicit indication of how they are to be interpreted.
Use ~http://ns.nuke24.net/TOGVM/Datatypes/JSONValue~ if you want to refer
- Generic XML documents
- Generic HTML documents
- Generic text documents