SOAP services use which technology to format information?

SATA (Serial ATA) is a hardware interface standard for connecting storage devices and has no role in web service message formatting.

PCI (Peripheral Component Interconnect) is a hardware bus standard for connecting internal components, unrelated to data formatting in services.

SOAP is a protocol specification that mandates XML as its message format for encoding requests and responses. Every SOAP message is an XML document consisting of an envelope, optional header, and body, making XML the foundational technology for SOAP-based web service communication. This is defined in the SOAP specification itself.

ISDN (Integrated Services Digital Network) is a set of communication standards for digital telephone networks, not a data formatting technology.