Support for EAD3

Develop guiding principles for EAD3 support in ArchivesSpace
- https://docs.google.com/document/d/1flWS83CRDvdc2cG8pWYA7bqRTckj9yJc3ucMBgLz8qE/edit?usp=sharing
Document changes required to support export of EAD3 from ArchivesSpace using current AS data model
- https://docs.google.com/spreadsheets/d/1i6m0WB43EpdCtzYyOImL5VRk-k2m1snRVeVsQ7F9gAY/edit?usp=sharing
Document required changes to AS data model to fully support EAD3 import/export
Gather (and document) feedback on EAD export specification (above) from TAC and other EAD3-interested parties
Work with HM or other developers to refine feature request for EAD3 support
- EAD3 Support JIRA: AR-923 - Getting issue details... STATUS
Help test any release candidates including EAD3 support

Migration tools, scripts, etc.

Gather information on community-developed EAD import validation tools and share on archivesspace-labs if/when available

"Background Work" - responding to user list queries

Monitor ASpace user list and Google group, serve as first responders for migration and import/export related posts, create JIRA issues as needed
Serve as a resource for members migrating data to ASpace from various legacy systems/formats (Access, FileMakerPro, etc.)

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