What is the right KQL syntax to query for all documents with property in managed metadata term hierarchy?

Question

What is the right KQL syntax to query for all documents where a given managed metadata property, "Document Category" has the value of a term which exists under a given parent term, "Sales and Marketing" in the term hierarchy?

Term Hierarchy:

Document Category (Term set)
 |
 |--- Sales and Marketing
 |      |
 |      |--- Some Document Category 1
 |      |
 |      |--- Some Document Category 2
 |
 |---- Some other category
 |      |
. . .

What we want is all documents where the property "Document Category" on the document has a value that is one of the terms under the "Sales and Marketing" node.

Answer 1

I've had good success with this tutorial

So if the guid for Sales and Marketing is c8a43f13-5ea1-45f2-b46d-3a1986a1cbd7 this would get all things tagged with a child of that.

owstaxIdItemType:"GPP|#c8a43f13-5ea1-45f2-b46d-3a1986a1cbd7"

But that wouldn't include anything that is actually tagged Sales and Marketing. If you want to have that included you would use

owstaxIdItemType:"GPP|#c8a43f13-5ea1-45f2-b46d-3a1986a1cbd7" OR
owstaxIdItemType:"GP0|#c8a43f13-5ea1-45f2-b46d-3a1986a1cbd7"

Answer 2

If you know there term ID which you can get from the MMS Term Store Manager or the Tag Summary Page you can your the following syntax to get all descendant children of the MMS property ItemType (the # at the beginning indicates child terms):

owstaxIdItemType=#52263385-1fc3-4323-8d6b-50c8f6c3c45d:"reference materials"

Ref: http://msdn.microsoft.com/en-us/library/office/ff625182(v=office.14).aspx