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The paper presents three different semanti … The paper presents three different semantic associations: ρ-Path, ρ-Iso, and ρ-Join. Few details are given about the ρ-Iso Association, but the description in section 2 describes it: "The paths p = p11, p12 ... p1n originating from r1 and p' = p11', p12' ... p1n' originating from r2 are semantically similar in that the corresponding edges in both paths are related in a subproperty relationship, therefore r1 and r2 are related by virtue of this similarity." This definition seems overly restrictive and simplistic to me. Can the presented ranking system be extended to allow for similar associations based on a tree or DAG of properties (not just a single path) from r1 and r2? Alternatively, could the ρ-Iso Association be extended to distinguish the similarity of r1 and r2 based on the similarity of rm and rn (the endpoints of the paths p and p')? rn (the endpoints of the paths p and p')?
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