From Semantic Web Technologies

Jump to: navigation, search

This page lists all known errors in the book. Names in parentheses indicate who first spotted and reported the error. Thank you for sending any further bug reports to us via email.

Correct version of Exercise 5.6 (p. 209) and its solution (p. 386)

Consider the two RDFS triples
r rdfs:domain A . and A rdfs:subClassOf B .
Understood as part of an OWL knowledge base, they can be expressed as \exists r.\top \sqsubseteq A and A \sqsubseteq B.
Give a triple which is RDFS-entailed by the two given triples, but which cannot be derived from the OWL DL semantics.
Furthermore, give an OWL DL statement which is a logical consequence of the two OWL statements but cannot be derived using the RDFS semantics.


The triple rdf:type rdfs:range rdfs:Class . is an axiomatic triple of RDFS and can thus be derived using the RDFS semantics. However, OWL DL does not allow us to use rdfs:Class; hence this statement cannot be derived using the OWL DL semantics.

The triple r rdfs:domain B . cannot be derived from the RDFS semantics. There is no easy way to check this, but you can exhaustively apply all deduction rules and then this triple will not be included. In DL syntax the triple becomes \exists r.\top \sqsubseteq B, which is a logical consequence of the two given statements. To see this, let I be an arbitrarily chosen model for the two given statements. Then, using the definition of model and the two given statements, we obtain (\exists r.\top)^I \subseteq A^I \subseteq B^I, which shows that (\exists r.\top)^I \subseteq B^I. Hence \exists r.\top \sqsubseteq B holds in I, and since I was an arbitrarily chosen model, \exists r.\top \sqsubseteq B holds in all models for the two given statements, and thus is a logical consequence from these two statements.

Minor corrections and typos

  • p. 2, footnote 1: "Dragonflies" should be "dragonflies"
  • p. 11, heading of Section 1.4: "Semanic Web Technologies" should be "Semantic Web Technologies" (reported by Andreas Harth)
  • p. 16, footnote 14: wrong font
  • p. 27: "The overall RDF graph therefore consists of four edges and four nodes." should be "The overall RDF graph therefore consists of four edges and five nodes." (reported by Harald Zauner)
  • p. 34, line 2: xml:namespace= should be xmlns:namespace=.
  • p. 56, line 6: "rdfs:range" should be "rdfs:domain"
  • p. 126, Figure 4.11: The last four lines of the OWL/RDF example should read: </owl:unionOf> </owl:Class> </rdfs:subClassOf> </owl:Class> (reported by Camille Pradel)
  • p. 181, last line: blank missing after comma. (reported by Manolis Koubarakis)
  • p. 185, line 3: "NNF(K)" should be "NNF". (reported by Manolis Koubarakis)
  • p. 193: In the example, x is not blocked by a1, since the latter is an individual. Refering to the tableau for the same example on p. 191, y is blocked by x, which suffices. (reported by Manolis Koubarakis)
  • p. 194, line 19: "male" should be "Male"
  • p. 196, line 6: \forall R should only appear once in L(b). (reported by Manolis Koubarakis)
  • p. 198, line 16 from below: The rightmost "Inv(R)" should simply be "R". (reported by Manolis Koubarakis)
  • p. 201, line 3: the conjunction at the end of the line should be set-intersection. (reported by Manolis Koubarakis)
  • p. 204, line 18: \geq F should be \geq 2 F. (reported by Manolis Koubarakis)
  • p. 204, line 24: replace "=" by "\leftarrow. (reported by Manolis Koubarakis)
  • p. 205, after step 8: Before step 9, the trans-rule needs to be applied to \forall A.h\in \mathcal{L}(x_1). (reported by Manolis Koubarakis)
  • p. 354, last line, should end in encoding="utf-16"?>. This also occurs on pp. 356, 358, 359 (twice).
  • p. 358, line 6 from below: type="xsd:string" should be type="&xsd;string". Similar errors occur later in Section A.3: wherever xsd: occurs in an attribute value, it should be replace by &xsd;.
  • p. 361, last example: there are two occurrences of &xsd, which should be replaced by &xsd;.
  • p. 387, Exercise 5.7, S\sqcap L occurring in \mathcal{L}(x) should be S\sqcap E (twice). (reported by Cong Wang)
  • p. 410, reference [MKH08]: The authors, correctly stated, are M. Knorr, J. J. Alferes, and P. Hitzler.
  • p. 424, main index entry for simplicity should be for page 169

Found an error – small or large – that is not listed on this page? Contact us now to make sure it will be gone in the next edition!