# Data Model: Relational Document System

This document outlines the key entities for the relational document system.

## Entities

### Document
- **Description**: A markdown file with YAML frontmatter.
- **Attributes**:
  - `type` (string): The type of the document (e.g., "person", "meeting").
  - `properties` (object): A set of key-value pairs defined in the YAML frontmatter.

### Schema
- **Description**: A definition for a document type, specifying its properties and their types. As per the clarification, schemas are not strictly enforced but are inferred from existing documents.
- **Attributes**:
  - `name` (string): The name of the document type.
  - `properties` (object): A dictionary of property names and their inferred types (e.g., string, number, date).

### Query
- **Description**: A definition in a custom block syntax that filters and sorts documents.
- **Attributes**:
  - `document_type` (string): The type of document to query.
  - `filters` (array): A list of filter conditions (e.g., `property == value`).
  - `sort_by` (array): A list of properties to sort the results by.

### View
- **Description**: A virtual buffer that displays the results of a query.
- **Attributes**:
  - `query` (Query): The query that generated the view.
  - `documents` (array): A list of documents that match the query.