A Schematron-formatted rule validating the placement of explicit complex glyph within a MIMML dataset. Blue: The context to which the set of rule assertions refer; in this case, entity glyphs of type "explicit complex". Red: Assertions related to the context XML element. In this case, an explicit complex may only exist on interactions of the following types: covalent modification, non-covalent reversible binding, covalent irreversible binding, and state combination. Green: A set of diagnostic entries to be displayed, if the test assertion fails, including the ID of the explicit complex glyph (vis-id), the ID of the interaction on which the explicit complex appears (inter-vis-id), and the types of arrowheads at the start and end of the interaction glyph (inter-start-arrowhead and inter-end-arrowhead).