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Fast Infoset (FI) is an international standard that details a binary-encoding information format as an Extensible Markup Language (XML) alternative. FI is engineered to support optimized serialization more efficiently than XML, which is based on text.
FI is officially known as International Telecommunications Standard Sector (ITU-T) Rec. X.891 and International Standard for Organization/International Electrotechnical Commission (ISO/IEC) 24824-1.
According to the FI standard, a data model is specified with the following components:
FI may be viewed as an XML gzip, even in cases where FI optimizes document size and computer resource usage. Like gzip, no information is lost during XML/FI conversion.