The question «what kind of entity is a belief?» has received no consensual answer in contemporary philosophical debate. The most recent and comprehensive evidence of this situation is a collective volume gathering fifteen incompatible responses to that single question, whose editors acknowledge that the book exhibits the form of philosophical disagreement rather than its resolution (Lewis-Jong and Schwitzgebel, 2026). This article argues that such disagreement has a structural explanation: the various traditions tend to operate upon an implicit ontological level—belief as a unit with content—that has not been explicitly formulated as a shared foundation. Five structural limits of the dominant model are identified, organized into three groups: problems of format, problems of unity, and problems of dynamics. Against them, a minimal structural ontology is proposed: beliefs are networks of stabilized functional assignments that organize a system's processing by linking discriminable configurations with recurrent response orientations. This infrastructure includes positive assignments and active exclusion functions that establish structural boundaries of admissibility within the processing space. The proposal does not compete with existing theories on their own level: it situates them as partially correct descriptions of distinct dimensions of the same structural phenomenon.
Luis Alberto Rebollo Campos (Thu,) studied this question.