# Interface Implementation Requirements Interfaces can require implementing types to also implement other interfaces of the same kind. Interface implementation requirements can be declared by following the interface name with a colon (`:`) and one or more names of interfaces of the same kind, separated by commas. ``` // Declare a structure interface named `Shape`. // pub struct interface Shape {} // Declare a structure interface named `Polygon`. // Require implementing types to also implement the structure interface `Shape`. // pub struct interface Polygon: Shape {} // Declare a structure named `Hexagon` that implements the `Polygon` interface. // This also is required to implement the `Shape` interface, // because the `Polygon` interface requires it. // pub struct Hexagon: Polygon {} ``` --- # 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://max-daunarovich.gitbook.io/flow-network/introduction/interfaces/interface-implementation-requirements.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.