The folder IfcSchema contains the schema-definition of different IFC-releases as C#-classes.
The datamodel of the Industry Foundation Classes (IFC) is defined in various releases as EXPRESS-files here: https://technical.buildingsmart.org/standards/ifc/ifc-schema-specifications/
The underlying meta-concept is shown is this picture:
A IFC-Model contains entities with attributes. An attribute are from types of TYPE, SELECT, ENTITY-Ref, ENUM and Lists (of attributes). SELECT itself can be TYPE, SELECT or ENTITY-Refs.
In IfcSharp the types ENTITY, TYPE, SELECT and ENUM are stored in 4 C#-Files, wich contain the informations of these types.
[ifcSql(TypeGroupId:5,TypeId: 472,TableId:3)] public partial class ActorRole:ENTITY{//================================================================================
public ActorRole():base(){}
public ActorRole(RoleEnum Role,Label UserDefinedRole=null,Text Description=null,string EndOfLineComment=null):base(){AddNext();this.Role=Role;this.UserDefinedRole=UserDefinedRole;this.Description=Description;this.EndOfLineComment=EndOfLineComment;}
public ActorRole(RoleEnum Role,string EndOfLineComment=null):base(){AddNext();this.Role=Role;this.EndOfLineComment=EndOfLineComment;}
[ifc(1)] public RoleEnum Role; //ENUM
[ifc(2,optional=true)] public Label UserDefinedRole; //TYPE
[ifc(3,optional=true)] public Text Description; //TYPE
[ifcInverse(For:"RelatedResourceObjects")] public LIST<ExternalReferenceRelationship> HasExternalReference;
}//=====================================================================================================================The C#-attribute ifcSql contains the class-information from the schema-database of ifcSQL.
TypeGroupId:5 means, that this class decribes an entity
TypeId: 472 means, that this is type with id-number 472 from the schema-database of ifcSQL
TableId:3 means, thats this class has the database-storetype of number 3.
The C#-attribute ifc contains the attribute-information from the schema-database of ifcSQL.
(1) means, that this is the first attribute in the STEP-file-order.
optional=true indicates, that this attribute is optional
The C#-attribute ifcInverse contains the inverse-information from the schema-database of ifcSQL.
For:"RelatedResourceObjects" decribe the name of the relating element.