# Summary - [Introduction](./introduction.md) # Specification - [Front and back end](./front_and_back.md) - [The frontend structure of a POD]() - [Frontend POD value types](./values.md) - [Anchored keys](./anchoredkeys.md) - [The backend structure of a POD]() - [Backend types](./backendtypes.md) - [MerkleTree](./merkletree.md) - [Signature](./signature.md) - [Deductions](./deductions.md) - [Statements](./statements.md) - [Operations](./operations.md) - [Simple example](./simpleexample.md) - [Custom statements and custom operations](./custom.md) - [Defining custom predicates](./custompred.md) - [Custom statement example](./customexample.md) - [How to hash a custom statement](./customhash.md) - [MainPOD](./mainpod.md) - [Introduction PODs](./introductionpods.md) - [Examples](./examples.md) # Architecture - [Architecture](./architecture.md)