human: What are the Definitions in the IPC?
assistant: Definitions are used for clarifying the exact boundaries of the subject matter appropriate for the classification place. They provide additional information in respect of classification entries and serve for their clarification, but do not change the scope of classification entries. They may consist of six subsections: Definition statement Relationship with other classification places References Special rules of classification Glossary of terms Synonyms and keywords Definitions are provided only for a limited number of subclasses and groups. In the course of the further development of the IPC, definitions will be elaborated for all its subclasses, and for main groups and subgroups, where appropriate. Definitions are accessible via the Internet publication of the IPC (a definition is available if there is an icon definition shown next to a symbol. See, for example, subclass G01S ; by clicking on the definition will open its definition). (See also paragraphs 44 to 47 of the “ Guide to the IPC ” for more information.)