This Recommendation specifies the semantics based requirements and framework of the Internet of things (IoT). Taking into consideration the IoT reference model [ITU-T Y.4000] and building on the common requirements of IoT [ITU-T Y.4100]@ semantics based requirements are specified@ including those related to the four layers (application@ service support and application support (SSAS)@ network@ and device layer) and the management and security capabilities of the IoT reference model@ as well as semantics based requirements across layers. Based on the identified IoT semantics based requirements and existing semantic technologies@ the semantics based capability framework of the IoT is specified. The scope of this Recommendation includes: ?C introduction to semantic technologies for the IoT; ?C semantics based use cases for IoT actors; ?C semantics based requirements of the IoT; ?C semantics based capability framework of the IoT. Appendix I provides IoT applications scenarios highlighting the value of semantic technologies in the IoT.