Drupal/schema
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The basic unit of content in Drupal is the node, which is represented by the nodes table. Key data concepts are:
- content type - not sure where this fits in
- node
- node type
- taxonomy
- taxonomy term - can be hierarchical - home table is taxonomy_term_data
- taxonomy vocabulary - groups of taxonomy terms - home table is taxonomy_vocabulary
Things you may encounter that aren't actually data concepts:
- Some common types of taxonomy_vocabulary (i.e. 'name' field of records that might be found in a typical Drupal database):
- "Categories"
- "Tags"
Rules
- Any node can be assigned to zero or more taxonomy terms. (taxonomy_index)
- Any taxonomy term can be assigned to zero or more nodes. (taxonomy_index)
- Each taxonomy term is assigned to exactly one taxonomy vocabulary. (taxonomy_term_data)
- Each taxonomy term has zero or one parent and zero or more children. (taxonomy_term_hierarchy)
- The assigned taxonomy vocabulary determines what type of hierarchy the assigned taxonomy term belongs to:
- multiple root nodes
- single root node
- flat list - no hierarchy