sp_MSinsert_identity (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_MSinsert_identity(nvarchar @publisher
, nvarchar @publisher_db
, nvarchar @tablename
, int @identity_support
, bigint @pub_identity_range
, bigint @identity_range
, int @threshold
, bigint @next_seed
, bigint @max_identity)

MetaData:

 CREATE PROCEDURE sys.sp_MSinsert_identity   
(  
    @publisher             sysname,  
    @publisher_db         sysname,  
    @tablename             sysname,  
    @identity_support    int,  
    @pub_identity_range bigint,  
    @identity_range     bigint,  
    @threshold             int,  
    @next_seed            bigint,  
    @max_identity        bigint = NULL  
)   
AS  
begin  
    declare @pub_seed         bigint      
    declare @current_max     bigint  
    --   
    --  security check  
    --  only db_owner can execute this  
    --   
    if (is_member ('db_owner') != 1)   
    begin  
        raiserror(14260, 16, -1)  
        return (1)  
    end  
    --   
    --  security check  
    --  Has to be executed from distribution database  
    --   
    if (sys.fn_MSrepl_isdistdb (db_name()) != 1)  
    begin  
        raiserror(21482, 16, -1, 'sp_MSinsert_identity', 'distribution')  
        return (1)  
    end  
    if not exists (select * from MSrepl_identity_range   
            where tablename=@tablename and LOWER(publisher)=LOWER(@publisher) and publisher_db=@publisher_db)  
    begin  
        select @pub_seed = @pub_identity_range + @next_seed  
        select @current_max = @pub_seed - 1  
        insert MSrepl_identity_range(publisher, publisher_db, tablename, identity_support, next_seed, pub_range, range, max_identity, threshold, current_max    )  
                values (@publisher, @publisher_db, @tablename, @identity_support, @pub_seed,  @pub_identity_range, @identity_range, @max_identity, @threshold, @current_max)  
        if @@ERROR<>0  
            return 1  
    end  
    else if 1 > 1 -- disable this segment for now.  
        begin -- adjust republisher's resource table  
            select @pub_seed = @pub_identity_range - 1  
            --  update range, threshold at republisher as needed. Max and next_seed has been set already.  --   
            update MSrepl_identity_range set    range = @identity_range,  
                                                pub_range = @pub_identity_range,  
                                                threshold=@threshold,   
                                                next_seed=next_seed + @pub_identity_range,  
                                                current_max=next_seed + @pub_seed -- new next_seed not yet picked up  
            where tablename=@tablename and LOWER(publisher)=LOWER(@publisher) and publisher_db=@publisher_db  
            if @@ERROR<>0  
                return (1)  
        end  
end