What are the main principles and recommendations for forming a unique application identifier in the form of a Bundle ID?

Bundle ID is a unique identifier for an app in the iOS ecosystem. Key principles when forming it:

• Use reverse domain style, for example: com.companyname.appname. This helps avoid conflicts with other developers.
• The Bundle ID must be unique for each app.
• Do not use spaces or special characters, except dots and alphanumeric characters.
• Usually, the Bundle ID does not change after the app is published, as it is linked to certificates and App Store settings.
• You can use sub-identifiers for different versions or modules of the app, for example: com.companyname.appname.widget.

Example:

com.example.myapp