package keyword in
build.yml allows packages to be built from other existing packages or components of existing packages.
included packages must exist and be installed locally
only package instances with the
latest tag can be included
users are not warned when information from private packages is included in new packages that are later made published
---contents:NODENAME: # Create a package with a node called `NODENAME`package: OWNER/EXISTING_PACKAGE/DATAFRAME # Pull its contents from a node, `DATAFRAME`, in an# existing package, `OWNER/EXISTING_PACKAGE`.