---
xip: 48
title: Queryable content types in Rust
description: This XIP proposes a new way of managing content types in XMTP to make complex content types like reactions, replies, and message filtering easier for XMTP integrators.
author: Cameron Voell (@cameronvoell)
status: Final
type: Standards
category: XRC
created: 2024-11-27
---
## Abstract
This XIP proposes a way of managing XMTP content types in protobufs and Rust to make complex content types like reactions, replies, and message filtering easier for XMTP integrators.
## Motivation
During the upgrade from XMTP V2 (Direct Messaging Only) to XMTP V3 (Groups via the MLS protocol), one developer experience improvement was that the new "V3" SDKs manage a local SQLITE database containing all of a user's groups and messages. At the same time, the core "libxmtp" library that manages all the database logic remained completely agnostic to the message "content types" that were being stored in the database. The fact that the local database code is content type-agnostic has made some queries that would be common in a production consumer messaging app impossible without forcing developers to implement their own extra local persistent data management. This XIP proposes a way to integrate XMTP content types with the core library and local SQLITE storage. This solution will enable the following new SDK functions:
1. Given a message ID, return all the reactions, replies, and read receipt status associated with that message.
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