# Topic Tag

> A formal definition of the tag for a file that defines a named stream of messages and its schema, filed in a topics folder.

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

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Bus Tag](https://banes-lab.com/records/lexicon/bus-tag.md) and before [Stream Tag](https://banes-lab.com/records/lexicon/stream-tag.md).

## Category

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