UMLR — XMI representation of stereotype application

I think that the source of confusion could be the paragraph in page 683 in 10-11-13.pdf

“The most direct implementation of the Profile mechanism that a tool can provide is by having a metamodel based

implementation, similar to the Profile metamodel. However, this is not a requirement of the current standard, which

requires only the support of the specified notions, and the standard XMI based interchange capacities. The profile

mechanism has been designed to be implementable by tools that do not have a metamodel-based implementation.”

In this paragraph the “XMI based interchange capacities” are mentioned, but there is not

a direct reference to page 684, to clarify that these the “XMI interchange capacities” are specified in 684. This paragraph

gives the impression that the XMI interchange format is not closed.