Thank you for purchasing Linked Data.
If you have found an error in Linked Data
that is not already outlined below, or you have thought of a general improvement for the book please post it
to the Author Forum on manning.com
and we will do our best to address the issue. Thanks!
The Sindice search entry point is no longer available from SameAs.org. The first paragraph should read:
Another avenue for discovery of Linked Data is SameAs.org, http://www.sameas.org.
The objective of SameAs.org is to identify equivalent URIs to the Linked Data URI entered.
The colloquial term "Tag" was used instead of the technically correct term "Element".
While we believe the message could still be understood this will be clearer in the long run. The second
and third paragraphs should read as follows (changed words are bolded):
The XML format is, as the name suggests, an XML representation of a SPARQL result set.
It is a W3C Recommendation and thus implemented by all SPARQL endpoints. Listing 5.18
provides an example of the results for the query in Listing 5.2 in the XML format.
Note that the <head> element contains a list of all the variables named in the SELECT
clause of the query. This facilitates parsing, even though the variable names may also
be found in the <results> element content. The <results> element contains zero or more
<result> element, each of which contains a result.
A <binding> element appears for each variable in a result. The name attribute indicates
the variable’s name and the enclosed tag indicates the binding’s data type (e.g. “literal”
or “uri” as shown here; other data types include “date”, “integer”, etc).
#A This is an XML document and so starts with an XML header.
#B This is a SPARQL results document. The <sparql> element provides the SPARQL results namespace.
#C The <head> element contains a listing of the variables from the SELECT clause of the preceding query.
#D The <results> element contains zero or more <result> element, each of which contains a result.
#E A <binding> element appears for each variable in a result. The “name” attribute indicates the variable’s
name and the enclosed tag indicates the binding’s data type (e.g. “literal” or “uri” as shown here).
The RDFa in the listing is missing the namespace for the GoodRelations vocabulary. The namespace should
be inserted in the list of namespaces between lines 12 and 18. The namespace line should look like this: