composer-docs/fhir-in-action/naming_conventions.md

Naming Conventions

In simple terms, a naming convention refers to a framework used for naming your files in a specific way.

Classes

Class names should be nouns, in mixed cases with the first letter of each internal word capitalized. Interfaces names should also be capitalized just like class names.

Methods

Methods should be verbs, in mixed case with the first letter lowercase and with the first letter of each internal word capitalized.

Variables

Variable names should not start with underscore _ or dollar sign $ characters, even though both are allowed.

Packages

The prefix of a unique package name is always written in all-lowercase ASCII letters and should be one of the top-level domain names, like com, edu, gov, mil, net, org.