# Retain the Prior State in the Spanning Layer

> A technique for keeping the earlier state of content in the layer that spans both states, so a change rule can compare them.

Record: `lexicon:retain-the-prior-state-in-the-spanning-layer`
Kind: technique
Layer: [Execution Core](https://banes-lab.com/records/layer/execution-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-retain-the-prior-state-in-the-spanning-layer

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Partition the Surface](https://banes-lab.com/records/lexicon/partition-the-surface.md) and before [Compare the Two Readings](https://banes-lab.com/records/lexicon/compare-the-two-readings.md).

## Category

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

## Refactors

- [State-Arity Limit](https://banes-lab.com/records/architecture/state-arity-limit.md)

## Linked from

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