# Components ### `input.json` The `input.json` file is a hierarchical structure of objects defined within a network. It contains information about the network, roles, journeys, cards, events, event handlers, and TuumIO ledgers. ### TuumIO Data Node The TuumIO Data Node (TDN) serves as the network's central database for storing and processing data files. It facilitates data exchange with external client systems, including electronic medical records, claims systems, member systems, and payment systems. ### TuumIO Card definitions A TuumIO Card is an interactive module encapsulating multiple data types, user interface elements, and interoperable functions. The TuumIO Card definition structure includes card data, layout, card footer, and UI actions. ### Event definitions Events define the interactions and communication between roles or nodes in the network, such as sending and receiving information. Events are chained together in a time series on a blockchain, creating a secure, transparent, and immutable record of transactions within the network. ### Event handlers An event handler is a set of instructions that execute tasks based on specific events. These tasks include updating records, transforming data, and identifying recipients for the next event. ### Python event handlers Python event handlers are designed to execute complex events and transactions that require data processing, analysis, import, and export. They can fetch external data in HL7, X12 EDI, XML, JSON, or CSV formats. ### Resources Resources contain predefined data that is inserted or updated automatically during initialization. ### Transactional data Transactional data consists of configurable data that can be referenced from roles, cards, or events within the network. --- # 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://docs.tuumio.com/protocol-guide/get-started/components.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.