ISO 16100-6:2018 defines the detailed interface services and protocols used in a matching method based on multiple capability class structures. This document also defines a CPTI (Capability Profile Template Interface) Service Group, an Extended CPI (Capability Profile Interface) Service Group and an Extended Matcher Interface Service Group, which is extensions of the Type 1, Type 2 and Type 3 services, respectively, specified in ISO 16100-3:2005,5.4.This document also defines the CCSI (Capability Class Structure Interface) Service Group, an additional service group used to create, register, access and modify a capability class structure for the reference manufacturing domain models specified in ISO 16100-5:2009, Clause 6.This document also specifies detailed contents of the specific part of a capability profile template defined in ISO 16100-5:2009, Clause 7.