MISMO Engineering Guideline (MEG) 25

MISMO Engineering Guideline (MEG) for Extending a Standard MISMO XML Schema (MEG 0025) was approved as Final in November of 2023.

MEG 0025 provides guidance on how to extend the MISMO Version 3.x XML schema. That is, the architecture provides an orderly way of “extending” a MISMO schema—enabling a message to hold additional data needed for mortgage processing that is not included in a specific MISMO XML schema version. The goals of the MISMO Extension Model are as follows:

  • Allow any container element to be extended (added on to);
  • Identify and separate MISMO data and extended data;
  • Allow extensions from multiple organizations to coexist in a single XML instance including within the same container;
  • Allow simultaneous schema validation of MISMO and OTHER content.

Additional details are provided in the MEG for handling EXTENSION containers and attributes.

Access Information for Members

MISMO Members can access MEG 25 within the Resource Library housed on MISMO's Collaboration Site, "MISMO Connect" here.

Access Information for Non-Members

Non-MISMO members can access MEG 25 here


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