> For the complete documentation index, see [llms.txt](https://pavan-joshi.gitbook.io/making-payment-transactions-smart/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://pavan-joshi.gitbook.io/making-payment-transactions-smart/data-models/type-reference.md).

# Type Reference

Type references for the data models

This page provides information about the available types of data models you can use to structure metadata. 

Depending on the implementation of a data model by different wallets, client applications shall cross-check the wallet-specific availability of the data model type, attributes and attribute types before using it to structure metadata.

## List of Types

### Embedded non-text objects

* [AudioObject](/making-payment-transactions-smart/data-models/type-reference/audioobject.md)