How to handle artifactId?

[keilw]

To allow easier switch between different implementations (at the moment, some dependency seems hard to avoid) it looks like a good move to use the same package names under "si.uom" for both.
How would you tell them apart?

• Different artifactId (something like "si-impl-se")
• Maven Qualifier, (see json-lib-2.4-jdk15 vs. json-lib-jdk13)

[keilw]

This could be of interest: http://stackoverflow.com/questions/12320322/build-multiple-artifacts-with-different-classifiers-at-once
One important aspect is, that while https://github.com/unitsofmeasurement/si-units/tree/master/quantity (the "API" defining reusable quantity types) is implementation-neutral and exists only once for all environments, some modules like https://github.com/unitsofmeasurement/si-units/tree/master/impl need to distinguish the underlying implementations in cases where this won't be possible via e.g. ServiceLoader.

While above StackOverflow tip aims at multiple resources, with more than one profile and one or more classifiers the "java" folders may be tweaked, while e.g. resources can be shared between those classes.

[keilw]

While classifier works reasonably well, some Maven plugins won't support it, so manual interaction is necessary. We may consider using a similar structure as e.g. Apache Tamaya https://repository.apache.org/content/groups/snapshots/org/apache/tamaya/tamaya-java8/