Conformance Clause

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Conformance Policy

FreeM attempts to comply with ANSI X11.1-1995 and the unpublished Millennium Draft Standard (MDS) from the MUMPS Development Committee, in routine buffers where the dialect setting is set to a particular version of the standard.

Routine buffers in FREEM dialect enable all nonstandard extensions.

This article attempts to track missing and/or nonstandard features in the current main branch of FreeM. It is a work-in-progress.


FreeM supports several forms of indirection that are nonstandard, as well as allowing indirection in several constructs where the standard prohibits it. Below is a list of some known instances of idiosyncratic indirection; please note that this list is by no means comprehensive:

  • FOR loops in FreeM support argument indirection
  • FreeM supports list indirection, such as S X="1,2,3",ARGS="X,"","",2" W $P(@ARGS), which will output 2


  • MERGE should be implemented as M[ERGE] postcond SP L mergeargument, but is currently implemented as M[ERGE] postcond SP mergeargument


  • Only the inclusive forms of these commands are currently implemented

Transaction Processing

  • Restartable transactions are not complete

Event Processing

  • ETRIGGER is not yet implemented
  • Of the event classes defined in the MDS, only the INTERRUPT evclass is implemented
  • The TRIGGER 'evclass' is nonstandard
  • The ^$EVENT SSVN is incomplete
  • Environment-wide events defined in ^$SYSTEM are nonstandard



  • Dotted routine names are nonstandard


  • The first subscript of ^$LOCK collates according to the rules for global and local subscripts, not as an nref, as FreeM uses globals as backing store for SSVNs. If someone wants to write the code to make this conformant, the maintainer will accept it.

Miscellaneous Language Features

  • ASSERT is nonstandard
  • WITH and USING are nonstandard
  • CONST is nonstandard
  • MAP is nonstandard
  • WATCH is nonstandard
  • THROW is nonstandard
  • $DIALECT is nonstandard