Appendix F: SpatialDDS URI Scheme (ABNF)

SpatialDDS defines a URI scheme for anchors, content, and services. The human-readable pattern is:

spatialdds://<authority>/<zone>/<rtype>/<rid>[;param][?query][#fragment]
  • authority — a DNS name, case-insensitive.
  • zone — a namespace identifier (letters, digits, -, _, :).
  • rtype — resource type (for example anchor, content, tileset, service, stream).
  • rid — resource identifier (letters, digits, -, _).
  • param — optional key=value parameters separated by ;.
  • query/fragment — follow RFC 3986 semantics.

ABNF

The grammar below reuses RFC 3986 terminals (ALPHA, DIGIT, unreserved, pct-encoded, query, fragment).

spatialdds-URI = "spatialdds://" authority "/" zone "/" rtype "/" rid
                 *( ";" param ) [ "?" query ] [ "#" fragment ]

authority      = dns-name
dns-name       = label *( "." label )
label          = alnum [ *( alnum / "-" ) alnum ]
alnum          = ALPHA / DIGIT

zone           = 1*( zone-char )
zone-char      = ALPHA / DIGIT / "-" / "_" / ":"

rtype          = "anchor" / "content" / "tileset" / "service" / "stream"

rid            = 1*( rid-char )
rid-char       = ALPHA / DIGIT / "-" / "_"

param          = pname [ "=" pvalue ]
pname          = 1*( ALPHA / DIGIT / "-" / "_" )
pvalue         = 1*( unreserved / pct-encoded / ":" / "@" / "." )

Notes

  • Comparison rules: authority is case-insensitive; all other components are case-sensitive after percent-decoding.
  • Reserved params: v (revision identifier), ts (RFC 3339 timestamp). Others are vendor-specific.
  • Semantics: URIs without ;v= act as persistent identifiers (PID). With ;v= they denote immutable revisions (RID).

Examples

spatialdds://museum.example.org/hall1/anchor/01J9Q0A6KZ;v=12
spatialdds://openarcloud.org/zone:sf/tileset/city3d;v=3?lang=en