Have you encountered SOAP and XML in practice?

Yes, I have encountered SOAP and XML in practice. SOAP is a messaging protocol that uses XML for data formatting. I usually used SOAP for integration with external services, where a strict message structure and security standards support were required. XML was used for describing data, validation via XSD, and transferring information between systems. For example, I implemented a client for calling SOAP services using libraries, parsed XML responses, and handled errors.