# Observer Tag

> A formal definition of the tag for a file that watches a subject and reacts when it changes, filed in an observers folder.

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

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Selector Tag](https://banes-lab.com/records/lexicon/selector-tag.md) and before [Listener Tag](https://banes-lab.com/records/lexicon/listener-tag.md).

## Category

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