# Modeling - [Entities](https://bxorm.ortusbooks.com/modeling/entities.md): Learn the basics of modeling ORM entities - [Properties](https://bxorm.ortusbooks.com/modeling/properties.md) - [Identifiers](https://bxorm.ortusbooks.com/modeling/identifiers.md): All about entity identifiers, from primary keys, and generators to composite keys and field types. - [Relationships](https://bxorm.ortusbooks.com/modeling/relationships.md): Entity relationships let you define an association between two entity types. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://bxorm.ortusbooks.com/modeling.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.