Ash Resource Fragment for TMF675 GeographicSite — named-location-style Place (exchange, office, branch, data centre, etc.).

Compose with BasePlace on a concrete leaf to get the TMF GeographicSite attribute set, an optional projected reference to an associated GeographicAddress, TMF camelCase jason wire shape, and a site-shaped outstanding signature.

Diffo.Provider.GeographicSite uses this fragment directly as the out-of-the-box TMF GeographicSite resource. Domain extenders compose the same two fragments on their own leaf for richer domain identity:

defmodule MyApp.SydneyExchange do
  use Ash.Resource,
    fragments: [Diffo.Provider.BasePlace, Diffo.Provider.BaseGeographicSite],
    domain: MyApp.Domain

  attributes do
    attribute :rack_count, :integer, public?: true
  end

  actions do
    create :build do
      accept [:id, :href, :name, :site_type, :site_code, :address_id, :rack_count]
      change set_attribute(:type, :GeographicSite)
    end
  end
end

Attributes

All site attributes are permissive — tighten on your derived leaf if needed.

• site_type — atom, free-form (e.g. :office, :exchange, :branch, :datacentre). Convention only; not constrained.
• site_code — string, an opaque human-readable identifier scoped to the site (e.g. "SYD-01").
• address_id — string FK to an associated address Place. Resolved by the :address calculation.

Address association — :address (projected)

A calculate :address calculation uses Diffo.Provider.Calculations.ProjectedRef to resolve address_id to the concrete GeographicAddress subtype (or a consumer-domain Address leaf) via AshNeo4j.worlds/1. Open-world by construction — works whether the target is Provider.GeographicAddress or MyApp.PostalAddress.

Result is nil when address_id is unset; a concrete address struct when resolved; %Diffo.Unknown{} when the id is set but can't be projected.

Wire shape (TMF675)

jason.pick selects base + site fields and renames to TMF camelCase (siteType, siteCode). Inherits BasePlace's encode_geo_json/2 customize — a no-op for typical Site records (no geometry).