☜	OMI - Fields Draft MDC Standard					☞

5.2 Fields

OMI messages are defined in terms of these 6 fields:

• Short integer <SI>: 1 byte represents an unsigned integer ranging from 0 to 255.
• Long integer <LI>: 2 bytes represent an unsigned integer ranging from 0 to 65 535, with the low order byte sent first (little endian).
• Very long integer <VI>: 4 bytes represent an unsigned integer ranging from 0 to 2³²–1. The bytes are sent in order of increasing significance, from low to high.
• Short string <SS>: a counted string comprising a 1 byte length <SI> followed by 0 to 255 bytes of data.
• Long string <LS>: a counted string comprising a 2 byte length <LI> followed by 0 to 65 535 bytes of data.
• Very long string <VS>: a counted string comprising a 4 byte length <VI> followed by 0 to 2³²–1 bytes of data.

Some transactions define the value of an integer field not as an integer but as a set of bits, each of which may assume the values B = 0 or B = 1. Bits are numbered by 0 <= n < N where N is the maximum number of bits in the field. The integer value of the field shall be computed as the sum of B*2ⁿ where B is the value of bit number n.

Copyright © Standard Documents; 1977-2024 MUMPS Development Committee;
Copyright © Examples: 1995-2024 Ed de Moel;
Copyright © Annotations: 2003-2008 Jacquard Systems Research
Copyright © Annotations: 2008-2024 Ed de Moel.

Some specifications are "approved for inclusion in a future standard". Note that the MUMPS Development Committee cannot guarantee that such future standards will indeed be published.

This page most recently updated on 29-Nov-2011, 20:00:20.

For comments, contact Ed de Moel (demoel@jacquardsystems.com)