slachiewicz opened a new pull request, #321:
URL: https://github.com/apache/maven-remote-resources-plugin/pull/321

   Closes #316. Stacked on #320.
   
   Adds three `$spdx` methods so a template can list each license once instead 
of once per dependency:
   
   - `$spdx.group($projects)` maps each SPDX expression to the dependencies 
that use it, sorted by expression.
   - `$spdx.ids($projects)` returns every license and exception ID those 
expressions use, each one once, so a template adds each license text once. A 
dual-licensed `CDDL-1.1 OR (GPL-2.0-only WITH Classpath-exception-2.0)` 
dependency contributes `CDDL-1.1`, `GPL-2.0-only` and `Classpath-exception-2.0`.
   - `$spdx.unresolved($projects)` returns the dependencies left out of the 
groups, whose declared licenses a template still has to list.
   


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