Parameters to include in ELC composite return

[jpjenk]

The following incomplete list of parameters are included from the Neotoma occurrence and dataset endpoints. Should they also be included in the composite return from ELC and are there PBDB parameters we can match to them:

1. altitude
2. value (under sample)
3. sample unit
4. doi (for dataset)
5. Collection unit
6. Collection unit ID

Also note, some sites have multiple datasets (as expected) but they all have the same dataset_id. In this case, is a DOI then the only way to differentiate them?