# Retention

> A formal definition of the lifetime axis that states what ends a piece of content, whether nothing, a newer version of itself, the completion of what it asked for, or its producer regenerating the whole surface.

Record: `lexicon:retention`
Kind: artifact
Layer: [Execution Core](https://banes-lab.com/records/layer/execution-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-retention

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Accumulator](https://banes-lab.com/records/lexicon/accumulator.md) and before [Mutability](https://banes-lab.com/records/lexicon/mutability.md).

## Category

- [Coordination Surfaces](https://banes-lab.com/records/lexicon-category/coordination-surfaces.md)

## Required by

- [Independent Lifetime Axes](https://banes-lab.com/records/architecture/independent-lifetime-axes.md)
- [Section Lifetime Divergence](https://banes-lab.com/records/architecture/section-lifetime-divergence.md)

## Linked from

- [Coordination Surfaces](https://banes-lab.com/ontology/principles/architecture-category-coordination-surfaces.md)

## Evidence in the code

- [models/coordination.model.md](https://banes-lab.com/source/coordination/models/coordination.model.md.md)