| SAbstractConcept | 
 A descriptor of a concept. 
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| SAbstractLink | 
 Represents an abstract meta-definition of node connections. 
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| SConcept | 
 Represents a concept 
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| SConceptFeature | 
 Member of a concept, named. 
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| SContainmentLink | 
 Containment links describe parent-child relationships. 
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| SDataType | 
 Data types define categories of persistable values 
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| SElement | 
 Common interface for all meta-entities. 
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| SEnumeration | 
Enumerations define collections of related  options.  
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| SEnumerationLiteral | 
 Represents an option in an enumeration 
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| SInterfaceConcept | 
 Represents an interface concept 
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| SLanguage | 
 Reference to a deployed/run-time language. 
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| SNamedElement | 
 A named meta-entity. 
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| SPrimitiveDataType | 
Deprecated.
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| SProperty | 
 Represents a concept property 
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| SReferenceLink | 
 Reference links describe relations that do not follow the parent-child relationships pattern. 
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| SScope | 
 Scope provides a set of nodes, visible in the particular context. 
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| SType | 
 Types define categories of values. 
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