In http://hl7.org/fhir/2015May/patient-example-f201-roel.json.html, the example reference to a photo is:

_"photo": [

_

First, the "B" should be capitalized. Second, I suspect the "@" is a remnant from a very old version of the spec where "@" was required before each resource ID (and in that case, it should be removed from these examples).