name: XSD
full_form: XML Schema Definition
context: The message body of a SIP message may contain the message of other protocols (SDP, SMS, etc.) and can be represented e.g. by XML. Therefore the type definitions for these protocols can be TTCN-3 as well as XSD definitions. As in principle the message body of a SIP message may host any XSD definition, SIP and XSD definitions are decoupled: To avoid import of all potential XSD definitions the XML body of SIP messages is defined as a charstring. This requires a two-stage encoding and decoding: In DL an XML message needs to be encoded in TTCN first before it gets put in the message body of a SIP message, in UL the XML message contained in the message body needs to be explicitly decoded in TTCN. By defining the XML message body as a charstring the SIP definitions are independent from any XSD definitions and a specific XSD definition needs to be known only when it is really used. An SDP message may be contained in the message body itself or in a MIME message. In both cases the SDP message is
description: XML Schema Definition (XSD) is a technology standard for defining and describing the structure of XML documents. In telecommunications, XSD is used to represent message bodies in SIP messages.
explanation: XSD is classified as a technology because it provides a standardized way to define and structure data, which is fundamental to technological operations within telecommunications.
section_title: 7.3.4Additional requirements for codec implementations (Message Body)
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