zhengj2007
commented
9 years ago From cmung...@gmail.com on October 18, 2007 14:35:10
has_integral_part can be construed as a macro-level type thing and/or dispensed with at the instance level
transformation_of is different. Definition and comment from RO reproduced below. If this is a macro, what does it expand to?
def: "Relation between two classes, in which instances retain their identity yet change their classification by virtue of some kind of transformation. Formally: C transformation_of C' if and only if given any c and any t, if c instantiates C at time t, then for some t', c instantiates C' at t' and t' earlier t, and there is no t2 such that c instantiates C at t2 and c instantiates C' at t2." [PMID:15892874]
comment: When an embryonic oenocyte (a type of insect cell) is transformed into a larval oenocyte, one and the same continuant entity preserves its identity while instantiating distinct classes at distinct times. The class-level relation transformation_of obtains between continuant classes C and C1 wherever each instance of the class C is such as to have existed at some earlier time as an instance of the distinct class C1 (see Figure 2 in paper). This relation is illustrated first of all at the molecular level of granularity by the relation between mature RNA and the pre-RNA from which it is processed, or between (UV-induced) thymine-dimer and thymine dinucleotide. At coarser levels of granularity it is illustrated by the transformations involved in the creation of red blood cells, for example, from reticulocyte to erythrocyte, and by processes of development, for example, from larva to pupa, or from (post-gastrular) embryo to fetus or from child to adult. It is also manifest in pathological transformations, for example, of normal colon into carcinomatous colon. In each such case, one and the same continuant entity instantiates distinct classes at different times in virtue of phenotypic changes.
From alanruttenberg@gmail.com on October 18, 2007 00:36:19
e.g. has_integral_part , transformation_of
have no instance level equivalents.
Seems that class/class relations are more macro like than instance level. They all expand into quite different sets of axioms.
Original issue: http://code.google.com/p/bfo/issues/detail?id=6