Extend the structure of the site by way of content models, data storage, field types, and navigation, so it is more understandable to users.
Fake media reference revisions by tracking the revision of each media object in a custom table and load the appropriate revision depending upon who is viewing it.
Provide formatters to allow in-place editing in a View or other display (full content, teaser...).
Simple unique string field.
It's a simple link field with shortened URI column in link table schema (VARCHAR(255)).
Bulk field module allows you to manage field instances to Entity types of Drupal core. Like:
Provides a multiple select form element and widget for options fields to allow options to be selected using checkboxes.