Unknowm key/value combination source/Maxar

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I look at a building and found the following

In the _Tag/Membership_ window I got somthing  that I really dont
understand.

What is the meaning of _key/value _combination source/*Maxar./*

  I understand that it will keep the nodes of the building but from
..... Shall I use any plugin  to see it  ?


Regarss