Reusable Expressions
When developing a pattern, it often happens that some expressions are used more than once in different parts of the pattern. To avoid repeating the metadata expression each time, so-called reusable expressions can be created. These are developed similar to a file template with the metadata editor. The reusable expressions can then themselves be used in other places of the pattern in the metadata editor (visible by purple placeholder).
Please see the Reusable Editor Guide to understand how to develop reusable template components using the Reusable Editor.