Fast Infoset specifies a binary encoding for the XML Information set. An XML infoset (such as a DOM node, StAX events or SAX events in programmatic representations) may be serialized to an XML 1.x document or, as specified by Fast Infoset, may be serialized to a fast infoset document. Fast infoset documents are generally smaller and faster to parse than equivalent XML documents.
There are no reported vulnerabilities