I have trouble understanding your example. What is "list of items" and what is "purpose *"? In a method you usually define a set of steps, and perhaps some additional features that are not steps. Not sure what you mean by partial match either. I will try to answer your question anyway, but I may update my answer if you clarify these parts.
If "purpose X" is nothing else than a consequence of the "list of items", then it does not matter that the prior art reference is silent regarding "purpose X", it discloses the "list of items" and "purpose X" is inherently there. Should this be the situation you are presenting, then yes, your claimed invention lacks novelty.
If you were to draft "purpose X" as a step in your claim, and that one is not explicitly or implicitly disclosed in the prior art reference, and it neither occurs as a consequence of the other features which are disclosed in said reference, then the claim is novel.
As a side note, your question concerns novelty, and you stated this: "I understand "novel" means all features of the claim are described in a single document." That statement is not correct. Something is novel if all the claimed features are not described in a single embodiment of a prior art reference.
About that, a silly example: I can disclose (in a same patent application) a first aspect of the invention relating to a motorbike comprising a battery for starting an electrical engine, and a second aspect of the invention relating to a car comprising an electrical engine. I did not say anything in the application that the battery could be used in the car as well. Now you claim in your application a car comprising an electrical engine and a battery for starting an electrical engine. Is your car novel over my disclosure? Yes, it is.
You mentioned "a single document", but your invention may also be not novel over two documents. Another example: I have a subsequent patent application where I disclose just one aspect of the invention that relates to a car comprising a spoiler in the back shaped such that it provides increased downforce for better grip. Somewhere in the description I state, the car comprises a diesel engine, or can be a car as in patent application US2010****** (which is the one from my previous example). Now you claim a car comprising an electrical engine and the same spoiler of my application. Is your car novel over my second patent application? No, it is not, my second patent application discloses such car even if it does not read "electrical engine" anywhere in the document itself.