Model

The developer's by-kind index: where each CORA aggregate's XPD content lives. It hosts no content of its own. Design-phase scaffold.

For the aggregate shapes see the architecture model and the per-BC modules.

Aggregate (BC)	Where at XPD
Asset (Equipment)	Inventory (in this zone)
Computed / virtual axes (Equipment)	Inventory (EnergyAxis)
Capability, Method (Recipe)	Techniques
Enclosure (Enclosure)	The beamline (28-ID-A optics, 28-ID-C experiment)
Zone, Conduit, Policy (Trust); Actor (Access)	Governance
Procedure, Recipe, Caution, Supply, Subject, Run, Campaign, Dataset, Decision	deferred (design-phase; see below)

Deliberately not here yet

This is a design-phase scaffold (descriptor + docs), mirroring the other NSLS-II and Diamond beamlines. Left out on purpose:

• No new Family. XPD is a reuse-and-reinforce deployment, the NSLS-II twin of Diamond i11 (powder diffraction) and i15-1 (total scattering / PDF): the flat panels bind Camera, the flux counters FluxMonitor, the sample environment TemperatureController (which i11 graduated, reinforced here at a second facility), the double-Laue monochromator Monochromator, the mirror Mirror, the pinhole Aperture, the exposure shutter Shutter.
• The held BeamPositionMonitor. The optics-hutch beam-position monitor binds the loose BeamPositionMonitor family that several APS and NSLS-II deployments use; it stays loose pending the sensor fold-vs-promote decision (DIAG-1), recorded in the promotion-review register.
• No new Capability or Method. Powder diffraction and total scattering sit on the deferred powder_diffraction / total_scattering Capabilities Diamond i11 and i15-1 left pending (TECH-1); XPD reinforces both without coining either and records no Practice. The azimuthal integration and PDF reduction are ComputePort work.
• The autonomous sample robot. Modelled as a deferred Procedure over the spine threaded through Subject custody (ROBOT-1), reusing the i03 / i15-1 autonomous-loop shape, not a new device family.
• The high-resolution channel alongside the modelled main PDF channel: the high-resolution monochromator (Mono:HRM, in the 28-ID-C hutch) and the downstream high-resolution endstation (28-ID-D) are noted and deferred together (ENDSTATION-1), the way SRX deferred its micro endstation and 32-ID modelled one of several instruments.
• The calibration diffractometer (Dif:2) and its Ecal wavelength-calibration routine (scanning against a standard to fit the beam wavelength) are a routine powder/PDF operation, deferred to a named question (CALIB-1) rather than modelled at this design phase. The dormant multi-analyzer stage (MAD:DMS) and the mono beam-defining slits (Slt:MB1 / Slt:MB2) are deferred alongside it.
• The in-situ / operando accessories: a QEPro UV-Vis spectrometer read in parallel with the diffraction pattern (a distinct optical-spectroscopy modality, not a Camera), the gas switcher, and the flash-sintering / electrochemistry power system, deferred to a named question (OPERANDO-1); the UV-Vis channel would need its own family decision when it lands.
• Operations and experiment views, integration scenarios, vendor Models. A runbook and registered Assets for a beamline CORA does not yet drive would be invention; they land when the design firms and the team confirms. The 2-BM Model page shows the shape a fully-modelled deployment carries.