ER — Error in recent change of definition of Practice

There was an error made in a recent change to the definition of practice. Please return the definition to the original "A practice is a repeatable approach to doing something with a specific purpose in mind."

The current definition states that a practice is a description...
A practice is not a description. A practice does not need to be described to be a practice.

Update glossary and language specification descriptions

This resolution makes the description of the Practice language element give a primacy to the definition as given in Clause 4 on what a practice actually is, while still providing additional information on what is included in a Practice model element in the language.