Page Comparison

...

When defining version numbers for your plugin, be sure that they conform to the development guidelines (/wiki/spaces/PD/pages/24721296 and /wiki/spaces/PD/pages/24721296 G017 and G019 in particular).

...

Note
Proper versioning of your plugin is a required guideline - see /wiki/spaces/PD/pages/24721296 and /wiki/spaces/PD/pages/24721296 G017 and G019.

...

Changes in the Data Model

...

Note
The `upgradeContent` method will only be invoked on nodes managed by the Entity Manager. The `upgradeContent` method is static. To use the Entity Manager (or any other service) in a static method, see /wiki/spaces/PD/pages/24721195 Using Services in Static Methods. Proper handling of content migration is a required guideline - see /wiki/spaces/PD/pages/24721296 G020.

...