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If the interpretation of an element of Knowledge Organization Systems (KOS) is different, the Simple Knowledge Organization System (SKOS) representation of the element is also different. This paper reveals the SKOS representation of elements related to synthesis in a hierarchy classification scheme based on the interpretation by Structure-expression Style Theory. This theory is different from the conventional ones. Methods: “Entry in main schedules,” “entry in auxiliary tables,” “auxiliary table,” and “entry created by synthesis (synthesis entry)” are included in the agenda as elements related to synthesis. The Nippon Decimal Classification (NDC) is used as an example of a hierarchy classification scheme. Results: This paper reveals the method that uses skos:Concept as a SKOS representation of “entry in main schedules” as well as the method that uses skos:Concept as a SKOS representation of “synthesis entry.” The paper also describes the method that uses SKOS semantic relations (e.g., skos:broader) as a SKOS representation of relationships between “synthesis entry" and another entry. “Entry in auxiliary tables” and “auxiliary table” could not be represented in SKOS. All elements that cannot be represented in SKOS relate to the expression style of the classification scheme and they are beyond the scope of SKOS. Previous studies are based on conventional theories, whereas this paper is based on Structure-expression Style Theory; thus, this paper differs in its interpretation and the SKOS representation of the following: “entry in auxiliary tables,” “auxiliary table,” and a part of “synthesis entry.” [ABSTRACT FROM AUTHOR]