This class is intended to describe the authorized form for a parameter, as a type or a value for a field.  
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|   | StepData_PDescr () | 
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| void  | SetName (const Standard_CString name) | 
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| Standard_CString  | Name () const | 
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| void  | SetSelect () | 
|   | Declares this PDescr to be a Select, hence to have members <me> itself can be the first member.  
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| void  | AddMember (const Handle< StepData_PDescr > &member) | 
|   | Adds a member to a SELECT description.  
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| void  | SetMemberName (const Standard_CString memname) | 
|   | Sets a name for SELECT member. To be used if a member is for an immediate type.  
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| void  | SetInteger () | 
|   | Sets <me> for an Integer value.  
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| void  | SetReal () | 
|   | Sets <me> for a Real value.  
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| void  | SetString () | 
|   | Sets <me> for a String value.  
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| void  | SetBoolean () | 
|   | Sets <me> for a Boolean value (false,true)  
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| void  | SetLogical () | 
|   | Sets <me> for a Logical value (false,true,unknown)  
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| void  | SetEnum () | 
|   | Sets <me> for an Enum value Then, call AddEnumDef ordered from the first one (value 0)  
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| void  | AddEnumDef (const Standard_CString enumdef) | 
|   | Adds an enum value as a string.  
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| void  | SetType (const Handle< Standard_Type > &atype) | 
|   | Sets <me> for an Entity which must match a Type (early-bound)  
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| void  | SetDescr (const Standard_CString dscnam) | 
|   | Sets <me> for a Described Entity, whose Description must match the type name <dscnam>  
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| void  | AddArity (const Standard_Integer arity=1) | 
|   | Adds an arity count to <me>, by default 1 1 : a simple field passes to a LIST/ARRAY etc or a LIST to a LIST OF LIST 2 : a simple field passes to a LIST OF LIST.  
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| void  | SetArity (const Standard_Integer arity=1) | 
|   | Directly sets the arity count 0 : simple field 1 : LIST or ARRAY etc 2 : LIST OF LIST.  
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| void  | SetFrom (const Handle< StepData_PDescr > &other) | 
|   | Sets <me> as <other> but duplicated Hence, some definition may be changed.  
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| void  | SetOptional (const Standard_Boolean opt=Standard_True) | 
|   | Sets/Unsets <me> to accept undefined values.  
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| void  | SetDerived (const Standard_Boolean der=Standard_True) | 
|   | Sets/Unsets <me> to be for a derived field.  
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| void  | SetField (const Standard_CString name, const Standard_Integer rank) | 
|   | Sets <me> to describe a field of an entity With a name and a rank.  
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| Standard_Boolean  | IsSelect () const | 
|   | Tells if <me> is for a SELECT.  
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| Handle< StepData_PDescr >  | Member (const Standard_CString name) const | 
|   | For a SELECT, returns the member whose name matches <name> To this member, the following question can then be asked Null Handle if <name> not matched or <me> not a SELECT.  
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| Standard_Boolean  | IsInteger () const | 
|   | Tells if <me> is for an Integer.  
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| Standard_Boolean  | IsReal () const | 
|   | Tells if <me> is for a Real value.  
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| Standard_Boolean  | IsString () const | 
|   | Tells if <me> is for a String value.  
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| Standard_Boolean  | IsBoolean () const | 
|   | Tells if <me> is for a Boolean value (false,true)  
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| Standard_Boolean  | IsLogical () const | 
|   | Tells if <me> is for a Logical value (false,true,unknown)  
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| Standard_Boolean  | IsEnum () const | 
|   | Tells if <me> is for an Enum value Then, call AddEnumDef ordered from the first one (value 0) Managed by an EnumTool.  
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| Standard_Integer  | EnumMax () const | 
|   | Returns the maximum integer for a suitable value (count - 1)  
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| Standard_Integer  | EnumValue (const Standard_CString name) const | 
|   | Returns the numeric value found for an enum text The text must be in capitals and limited by dots A non-suitable text gives a negative value to be returned.  
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| Standard_CString  | EnumText (const Standard_Integer val) const | 
|   | Returns the text which corresponds to a numeric value, between 0 and EnumMax. It is limited by dots.  
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| Standard_Boolean  | IsEntity () const | 
|   | Tells if <me> is for an Entity, either Described or CDL Type.  
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| Standard_Boolean  | IsType (const Handle< Standard_Type > &atype) const | 
|   | Tells if <me> is for an entity of a given CDL type (early-bnd) (works for <me> + nexts if <me> is a Select)  
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| Handle< Standard_Type >  | Type () const | 
|   | Returns the type to match (IsKind), for a CDL Entity (else, null handle)  
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| Standard_Boolean  | IsDescr (const Handle< StepData_EDescr > &descr) const | 
|   | Tells if <me> is for a Described entity of a given EDescr (does this EDescr match description name ?). For late-bnd (works for <me> + nexts if <me> is a Select)  
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| Standard_CString  | DescrName () const | 
|   | Returns the description (type name) to match, for a Described (else, empty string)  
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| Standard_Integer  | Arity () const | 
|   | Returns the arity of <me>  
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| Handle< StepData_PDescr >  | Simple () const | 
|   | For a LIST or LIST OF LIST, Returns the PDescr for the simpler PDescr. Else, returns <me> This allows to have different attributes for Optional for instance, on a field, and on the parameter of a LIST : [OPTIONAL] LIST OF [OPTIONAL] ...  
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| Standard_Boolean  | IsOptional () const | 
|   | Tells if <me> is Optional.  
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| Standard_Boolean  | IsDerived () const | 
|   | Tells if <me> is Derived.  
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| Standard_Boolean  | IsField () const | 
|   | Tells if <me> is a Field. Else it is a Type.  
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| Standard_CString  | FieldName () const | 
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| Standard_Integer  | FieldRank () const | 
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| virtual void  | Check (const StepData_Field &afild, Handle< Interface_Check > &ach) const | 
|   | Semantic Check of a Field : does it complies with the given description ?  
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  Public Member Functions inherited from Standard_Transient | 
|   | Standard_Transient () | 
|   | Empty constructor.  
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|   | Standard_Transient (const Standard_Transient &) | 
|   | Copy constructor – does nothing.  
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| Standard_Transient &  | operator= (const Standard_Transient &) | 
|   | Assignment operator, needed to avoid copying reference counter.  
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| virtual  | ~Standard_Transient () | 
|   | Destructor must be virtual.  
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| virtual const opencascade::handle< Standard_Type > &  | DynamicType () const | 
|   | Returns a type descriptor about this object.  
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| Standard_Boolean  | IsInstance (const opencascade::handle< Standard_Type > &theType) const | 
|   | Returns a true value if this is an instance of Type.  
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| Standard_Boolean  | IsInstance (const Standard_CString theTypeName) const | 
|   | Returns a true value if this is an instance of TypeName.  
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| Standard_Boolean  | IsKind (const opencascade::handle< Standard_Type > &theType) const | 
|   | Returns true if this is an instance of Type or an instance of any class that inherits from Type. Note that multiple inheritance is not supported by OCCT RTTI mechanism.  
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| Standard_Boolean  | IsKind (const Standard_CString theTypeName) const | 
|   | Returns true if this is an instance of TypeName or an instance of any class that inherits from TypeName. Note that multiple inheritance is not supported by OCCT RTTI mechanism.  
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| Standard_Transient *  | This () const | 
|   | Returns non-const pointer to this object (like const_cast). For protection against creating handle to objects allocated in stack or call from constructor, it will raise exception Standard_ProgramError if reference counter is zero.  
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| Standard_Integer  | GetRefCount () const noexcept | 
|   | Get the reference counter of this object.  
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| void  | IncrementRefCounter () noexcept | 
|   | Increments the reference counter of this object.  
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| Standard_Integer  | DecrementRefCounter () noexcept | 
|   | Decrements the reference counter of this object; returns the decremented value.  
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| virtual void  | Delete () const | 
|   | Memory deallocator for transient classes.  
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This class is intended to describe the authorized form for a parameter, as a type or a value for a field. 
A PDescr firstly describes a type, which can be SELECT, i.e. have several members