package_metadata
describes a package
Items:
| Name | Type | Doc | Constraints |
|---|---|---|---|
| id | string | id of the package | |
| urn | string | urn of the package | |
| author | string | package author | |
| name | string | name of the package | |
| version | string | the version of the package | |
| description | string | short description of the package's purpose |