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• A tag named "bimCode" may be added to every asset (Node of any Definition of Structure). It is used to define a unique identifier for each Node relatively to a BIM Model. It may be the GUID (if it's granted that it will not change during the project) or a combination of any attribute that makes it unique and unchangeable.
• A tag named "mepCode" may also be added to every asset to provide a MEP name if Mechanical, Electrical or Plumbing subcontractors used different naming from the MSI or BIM called.
• In a perfect world, the displayName, bimCode and mepCode would be similar
• The id (unique identifier of each asset) is most of the time self generated by the BOS but in some cases it can be defined from a third party data model such as BIM. (BIM guid are not always stable during a project and can't always be trusted) 
• Additional tags can be added relatively to the site (a BIM uuidguid, a manufacturer code...), they are not described here since they can be different from site to site.
• Syntheses and Global commands are defined by default in the relative to the Structure model. See Linksper Syntheses and Global commands for more information.

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