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Module Glossary

Page Maps

graph LR
  family["Python Programming"]
  program["Python Meta-Programming"]
  section["Descriptor Systems Validation Framework Design"]
  page["Module Glossary"]
  capstone["Capstone evidence"]

  family --> program --> section --> page
  page -.applies in.-> capstone
flowchart LR
  orient["Orient on the page map"] --> read["Read the main claim and examples"]
  read --> inspect["Inspect the related code, proof, or capstone surface"]
  inspect --> verify["Run or review the verification path"]
  verify --> apply["Apply the idea back to the module and capstone"]

This glossary belongs to Module 08: Descriptor Systems, Validation, and Framework Design in Python Metaprogramming. It keeps the language of this directory stable so the same ideas keep the same names across lessons, practice, review, and capstone discussion.

How to use this glossary

Use the glossary when framework-shaped descriptor discussions start to blur together cache policy, external sources of truth, wrapper fields, hint-driven validation, and broader architecture. Module 08 is meant to keep those boundaries explicit.

Terms in this directory

Term Meaning in this directory
Cache invalidation The explicit act of clearing or refreshing a cached descriptor value when its dependencies or source data change.
Composed field A descriptor built by wrapping one field descriptor in another so an extra concern can be layered through delegation.
External source of truth The backing store outside the instance that ultimately owns a field's persisted value.
External-storage descriptor A descriptor that reads from or writes to backend-managed state rather than relying only on instance-local storage.
Field wrapper A delegating descriptor layer that adds one concern around an inner descriptor, such as validation or logging.
Framework boundary The point where descriptor behavior is no longer just per-field semantics and now requires explicit architectural owners.
Hidden I/O The case where ordinary attribute access performs backend reads, writes, or serialization work that is not obvious from the syntax alone.
Hint-driven field A descriptor that reads annotations or Annotated[...] metadata as runtime evidence for validation or coercion.
Identity map A broader framework mechanism that keeps one in-memory object per record identity, explicitly outside the scope of a single descriptor.
Read-through cache A cache strategy where a descriptor fetches from the authoritative backend on miss, stores the value locally, and returns it.
Serialization boundary The conversion point between Python values and stored representations such as JSON strings.
Source of truth The location or system whose value should be treated as authoritative when field state and cached state diverge.
Unit of work A wider framework pattern for coordinating multiple persistence changes together, beyond what one field descriptor should own.
Write-through behavior The strategy of persisting a new field value to the backend immediately when assignment occurs, while also updating local cached state.
Annotated[...] metadata Extra runtime metadata attached to a type annotation and often used here for validator-style field behavior.

Keep the module connected