– "Facets" is described as a set of attributes in the text on line 279, but is not shown on Figure 1. It is suggested that the facet attributes be identified as such in Figure 1 and it is suggested that they be grouped together.

– Many of the attributes for facets as described in 4.18.1 through 4.18.11 are identical to those shown in Figure 1 (e.g. display, displayName) for obix::obj but not all (e.g. min, max). It is suggested an explanation or clarification be given why not all attributes are shown.

– An explanation should be given or significance of why some attributes are considered "facets" while others are not; e.g. perhaps a clear description of the facet group would be appropriate.