[[!comment format=mdwn
 username="grawity@2ea26be48562f66fcb9b66307da72b1e2e37453f"
 nickname="grawity"
 subject="comment 1"
 date="2016-01-21T08:35:52Z"
 content="""
The `present` expression is mentioned in [standard_groups](https://git-annex.branchable.com/preferred_content/standard_groups/) but doesn't seem to be explicitly documented anywhere. Is it basically the preferred-content equivalent of `--in .`?
"""]]
