# Operation Extension Without Element Change

> The ability to add new operations over a structure without modifying its element classes.

Record: `lex:operation-extension-without-element-change`
Kind: capability
Layer: [Design Patterns Core](https://banes-lab.com/records/layer/design-patterns-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lex-operation-extension-without-element-change

## category

- [Behavioral Patterns](https://banes-lab.com/records/lex-category/behavioral-patterns.md)

## referenced-by

- [Visitor Pattern](https://banes-lab.com/records/arch/visitor-pattern.md)