I was looking up a description of this, as I am an SP/SX/SO, and the following turned up:
These people often have an earthy, mysterious quality to them. They are quietly intense, but to others may seem oblivious to the greater social world around them, instead favoring personal interests. They are slow to commit, but once they do it is with an attitude of life commitment, to the establishment of an impermeable bond. Others can be taken aback by how suddenly and completely this type can lock into them, and by the depth of understanding of the other's condition. They attach to others at an organic, root level, in contrast to the other subvariant's surface formality. Somewhat hesitant to enter new relationships, they instead preserve the select few enduring bonds they carefully form along the way. The sanctuary of home is of paramount concern, and this type takes particular delight in decorating their spaces to reflect their cherished sense of taste and depth. Depth and discrimination characterize this stacking.
Motivation: to live in a secure, comfortable environment where they can pursue their private interests in depth.
Familiar Roles: the mate, the mystic, the quiet supporter.
Examples: George Harrison, Jackie Onassis, Eric Clapton, Emily Dickinson"
"Expression: wistful self-absorbed expression, sighing, magic is in their head
Energy: calm, steady energy expressed intensely, withdrawing
Behavior: withdrawn, calm, wistful and self absorbed
Mindset: "I can have merging/intensity without having to leave my orderly & pleasing lifestyle." (imagination, safe people and relationships, when the safety of these are challenged they withdraw)
Examples: Alanis Morisette, Amelie (Amelie)"
Now, all of this seems VERY INFP to me.
I'm having a hard time finding a description of anything INTP-like.
Then again, I have not taken the test for this in some time.
Any knowledge or opinions?