DMN17 — Clarification on href in DMN references

According to 13.3.2 References within the DMN XSD, when hrefs refer to DRG elements in another file the hrefs are defined as below:

DMN elements of type DMNElementReference support referencing by ID, across files, by utilizing an href attribute whose value must be a valid URI reference [RFC 3986] where the path components may be absolute or relative, the reference has no query component, and the fragment consists of the value of the id of the referenced DMN element.

The semantics of the part of the URI before the fragment that contains the ID (e.g. #prebureauriskDec01) is not very clear. Is the location of the DMN file or the namespace of the model in the DMN file?