User requirements:

• As a user I want to create nodes with various types
• As a user I want to get notifications about nodes to receive
• As a user I don't want to wait too long while the tree will be retrieved
• As a user I want to protect by a password the whole tree a certain branch
• As a user I want to have various node types: binary, wish, text, link,
• As a user I want to be able import XMind schemas

Technical decisions:

• Store files directly in the disk
• Use Graph database to represent relationships between nodes
• Use Elastic Search to be able use full text search