Package template implements string substitution in the style of Python's string.Template library as extended by Docker Compose.

Map of string to string that can be marshalled as either a !!map or a !!seq.

This is a temporary placeholder for fields that we presently don't support, but are safe to ignore.

String is a scalar leaf node in a compose document.

A sequence of strings that may be marshalled as an individual string.

Some sections and subsections can be expressed as either a map or sequence.