sp_addrole (Transact-SQL MetaData) Definition

Please note: that the following source code is provided and copyrighted by Microsoft and is for educational purpose only.
The meta data is from an SQL 2012 Server.

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Definition:

sys.sp_addrole(nvarchar @rolename
, nvarchar @ownername)

MetaData:

 create procedure sys.sp_addrole  
    @rolename   sysname,        --  name of new role  
    @ownername  sysname = NULL  --  name of owner of new role  
as  
    --  SETUP RUNTIME OPTIONS / DECLARE VARIABLES --   
    set nocount on  
    declare @ret        int,    --  return value of sp call  
            @owner      int,  
            @stmtR        nvarchar(4000),  
            @stmtS        nvarchar(4000)  
  
    --  DISALLOW USER TRANSACTION --   
    set implicit_transactions off  
    if (@@trancount > 0)  
    begin  
        raiserror(15002,-1,-1,'sys.sp_addrole')  
        return (1)  
    end  
  
    exec @ret = sys.sp_validname @rolename  
    if @ret <> 0  
        return(1)  
  
    if @ownername is null  
        select @ownername = user_name()  
  
    set @stmtR = 'create role '  
    set @stmtR = @stmtR + quotename(@rolename, ']')  
    set @stmtR = @stmtR + ' authorization '  
    set @stmtR = @stmtR + quotename(@ownername, ']')  
  
    --  Create Schema if not one exists with same name and owner  
    set @stmtS = 'create schema '  
    set @stmtS = @stmtS + quotename(@rolename, ']')  
    set @stmtS = @stmtS + ' authorization '  
    set @stmtS = @stmtS + quotename(@rolename, ']')  
      
    BEGIN TRANSACTION  
  
    --  issue DDL to create the role --   
    exec (@stmtR)      
    if @@error <> 0  
    begin  
        ROLLBACK TRANSACTION  
        return (1)  
    end  
  
  
    --  create the Schema if not one exists with same name and owner  
    declare @schema_uid int  
    declare @owner_uid  int  
    select @owner_uid  = principal_id from sys.database_principals where name = @rolename  
    select @schema_uid = principal_id from sys.schemas where name = @rolename  
    if (@schema_uid is null or        --  there is no schema since if there is one, it will have an owner  
        @schema_uid <> @owner_uid)  --  for error message  
    begin  
        exec (@stmtS)  
        if @@error <> 0  
        begin  
            ROLLBACK TRANSACTION  
            return (1)  
        end  
    end  
  
    COMMIT TRANSACTION  
  
    --  RETURN SUCCESS --   
    return (0) --  sp_addrole