This source tree holds a reference copy of M components for VistA, the Veterans Health Information Systems and Technology Architecture. It is maintained by OSEHRA, the Open Source Electronic Health Record Agent.

This source tree contains a static representation of VistA M components exported for representation on the host filesystem. VistA is built on a database platform that houses both code and data so it requires programmatic operations to apply changes while maintaining consistency. See the OSEHRA VistA Source Tree for tools to load these VistA components into a M database and for patches that may be applied to a running VistA instance to keep it up to date.

The source tree is organized as follows:

• Packages.csv: A spreadsheet recording VistA packages. For each package it has a name, namespaces, file numbers and names, and a directory name for this source tree.
• Packages/<package>/Routines/: Holds M routine .m sources.
• Packages/<package>/Globals/: Holds M global .zwr files. M globals are organized into host files by FileMan file. Each .zwr file is either named <num>+<name>.zwr for FileMan file number <num> with name <name> or named <gbl>.zwr for a <gbl> global not holding a FileMan file.

• OSEHRA Homepage: http://osehra.org
• OSEHRA Repositories: http://code.osehra.org
• OSEHRA Github: https://github.com/OSEHRA
• OSEHRA Gitorious: https://gitorious.org/osehra
• VA VistA Document Library: http://www.va.gov/vdl