# Engine Tag

> A formal definition of the tag for a file that runs the central loop advancing a system's state, filed in an engines folder.

Record: `lexicon:engine-tag`
Kind: artifact
Layer: [Structural Core](https://banes-lab.com/records/layer/structural-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-engine-tag

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Runtime Tag](https://banes-lab.com/records/lexicon/runtime-tag.md) and before [Executor Tag](https://banes-lab.com/records/lexicon/executor-tag.md).

## Category

- [Runtime Concerns](https://banes-lab.com/records/lexicon-category/runtime-concerns.md)

## Linked from

- [Refused Tags](https://banes-lab.com/ontology/lexicon/lexicon-category-refused-tags.md)