SHACL use cases

[bryjbrown]

SHACL could be potentially useful for certain purposes in CLAW. While there's no current PHP implementation, let's explore possible use cases for SHACL.

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Title (Goal)	SHACL for metadata form import/export format
Primary Actor	Repository architect, implementer, repository admin
Scope	form building & sharing
Level	Low
Story	As a metadata librarian, I want to be able to share my form for object metadata with the CLAW community so they they use or modify it in their own repositories.

Examples:

• Sharing a research data set form for comparison with other institutions
• Importing another institution's ETD entry form or providing it as part of a module
• Editing SHACL files that drive form building so that form definitions are under version control

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Title (Goal)	SHACL for collection policy management
Primary Actor	repository admin
Scope	access
Level	Low
Story	As a repository admin, I want to define a collection policy that only allows certain types of objects in the collection..

Examples:

• Creating a collection that should only have ETDs

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Title (Goal)	SHACL for metadata QA
Primary Actor	metadata librarians
Scope	metadata
Level	Low
Story	As a metadata librarian, I want to construct various definitions of objects to establish quality standards, and query the data in the repository against these definitions to find objects with insufficient or incorrect metadata.

Examples:

• I want to say that "proper" ETDs must have exactly one defense date and must have at least one advisor, and query the repository for ETDs that fail this definition.
• I want to say that all objects must have at least 3 subject tags, and query the repository to find objects that need more tags.

[dannylamb]

@bryjbrown Your first use case is already provided by Drupal form modes. See https://www.drupal.org/docs/8/api/entity-api/display-modes-view-modes-and-form-modes