The Foundation Taxonomy (data model) can be easily extended by the addition of new Nodes (CIs), attributes, and relationships. This is in addition to the ability to create new attributes on an existing Node ‘on the fly’ in a pattern.
Framing this capability a little: Foundation is not intended to be a general purpose CMDB, however with/without a CMDB in the environment it often makes sense to extend the Taxonomy to include non-discoverable Nodes/Attributes. This allows seamless exploitation in conjunction with the existing Nodes, for reporting purposes. Taxonomy extension is regarded as an advanced customization and is usually performed by a trained/certified resource.
I have attached some instruction about how to extend the Taxonomy in the event that you want to give it a try.
On the subject of the ‘on-the-fly’ attributes, these do not appear in the Taxonomy browser, but can be listed through a generic query. An example for the ‘Host’ node would be:
Search Host show explode keys(#) PROCESS WITH unique(1)