Both OnixS::FIX::SBE::Encoder and OnixS::FIX::SBE::Decoder constructors require the string, that contains the XML-based descriptions of coding rules, called SBE templates.

SBE Template

A SBE template represents an XML-based description of encoding and decoding rules in accordance with the SBE specification.

A template identifier (Template ID) is assigned for each SBE template, which uniquely identifies the encoding/decoding rules.

Note: More than one SBE template can be used to encode the same FIX message type.; The SBE template often contains schema version specification at "version" attribute of the root XML node. This means that any version with lower number can be actually used to decode/encode messages.