Entity Types

Core Drupal Concepts

Concept	Description	LEAF Specifics
Drupal Entity	The base unit of structured data in Drupal. Anything stored in the system is an entity: a page, a vocabulary term, a user, a file. Entities have a type, an ID, and fields.	--
Node	A content entity—any piece of content with a URL, fields, and a publish state. All LEAF content types are nodes.	Four node content types in LEAF: Basic Page, Article, Repository Item, Entity Descriptive Record.
Taxonomy	Drupal's controlled vocabulary system. A Taxonomy Vocabulary is a named set (e.g., "Subjects"); a Taxonomy Term is one entry inside it (e.g., "Digital Humanities"). Both are entities.	Used for keywords, subject headings, content tags, genres, etc. They can be set up as search facets.

Content Types (Node sub-types)

Type	Brief Description	Description	Key Fields	LEAF Specifics
Basic Page	Web content node	A structured page for a project (working group pages, about pages, etc.)	Title Language Large descriptive area (rich text + accordions) Layout Simple text fields Relevant links Menu placement	Must be added to the menu manually.
Article	Blog/news-style node	Simpler content that can be aggregated into a project news feed.	Title Body Tags (taxonomy terms) Featured image	Tags link articles to taxonomy terms from the project Lexicon or site-wide vocabularies.
Repository Item	Islandora digital object node	Represents a single digital resource.	Title Metadata (creator, date, subject, etc.) Media (file) Keywords/Subjects Collection membership Access/embargo settings	Managed via the repository interface, supports bulk ingest & operations.
Entity Descriptive Record (EDR)	Custom LEAF named-entity node	Describes a real-world entity.	Name Type (Person / Org / Place / Title / Concept) Description Authority IDs (VIAF, ISNI, etc.) Related items	Can be expanded to cover concepts.

Taxonomy Terms & Vocabularies

Term	Description
Taxonomy Term	One controlled vocabulary entry—e.g., "Feminist Theatre" in a Subjects vocabulary. Applied to nodes as metadata tags. Appears as a clickable facet in repository search results.
Lexicon (CWRC)	CWRC's name for a project-level (or shared) taxonomy vocabulary used for editorial tagging. Project Administrators manage its terms. Lexicon terms are available for annotating repository items.

How They Relate at a Glance

Concept	Relationship
Drupal Entity	Everything below is a Drupal entity.
Node	Basic Page Article Repository Item EDR
Taxonomy	Vocabulary (e.g. Subjects) Terms (e.g. "History") Lexicon (project vocab)
Repository Item	Has Media Tagged with Taxonomy Terms Linked to EDRs Belongs to a Collection Lives in a Project
Entity Descriptive Record (EDR)	Describes a single Taxonomy term Aggregates resources from within the project that reference said term Lives in a Project