Hello,
I tried the exercises on SPARQLMotion and found the tutorial amazingly good !
As it goes, here and there are some typing errors we could report, or
suggestions from a novel user's point of view.
There are here-after. In the hope you can use them to spare time for others in
searching.
Again, congratulations, I leaned a lot. Hope we will find more of those.
Page 7, point 4:
4. From the Scripts menu, select Create SPARQLMotion
Script. This will prompt you for the first module
Page 13, the construct query:
CONSTRUCT {?country1 owl:sameAs ?country2}
WHERE {?country1 a http://www.topbraid.org/owl/geo/region#Country.
?country1 <http://www.topbraid.org/owl/geo/US-states#postalAbbreviation> ?value.
?country2 a http://topbraid.org/countries#Country.
?country2 <http://topbraid.org/countries#abbreviation> ?value.}
It is interesting to note the URL's are automatically imported and converted
into prefixes.
If a fill URL remains, there is a typing error.
This might be a feature added afterwards in TB but it is mentioned no where
until now.(except my mistake)
Page 18, point 3:
Click Debug to run the script. Select all check boxes as shown
in the dialog and click Close.
The dialog shows the option "infer result triples (temporarily) unchecked.
To obtain the expected results, we have to check the box however.
Perhaps replace the picture could be an idea ?
Page 21, comments to point 19:
- those
we generated (output of SelectDBPediaURI) and those
that come from the capitals.owl model
(LoadCountries). Therefore we merge these triples by
Proposition to replace capitals.owl by countries.owl in the text.
Page 22, point 20
After running the construct, when we look at the "home" page, we can find a
warning message stating "Warning: This model currently contains more than one
owl:Ontology".
This is due to a xml:base statement.
When clicking the link, TB proposes to correct.
Would it be a good practice to foressee this automatically or as a standard
procedure in the tutorial ?
Page 23, point 27
LET (?namespaceURI := smf:buildURI ("{?namespace}")) .
The additional bracket makes the construct query work.
Page 24, point 9
WHERE { LET (?namespaceURI := smf:buildURI ("{?namespace}")) .}
The additional bracket makes the construct query work.
Page 26, point 5
5. Create an instance of ReturnText (subtype of Export To Remote) and name it
ReturnCapital_
script. Connect CreateResponse to ReturnCapital.
The underscore proposed at the EOF is used further in the exercise.
Page 27, point 11
11. The script will take a string as an input (via sp:arg1), query the
ontology, and return the result. Enter
the following query in GetCapital:
SELECT ?capitalLabel
WHERE {LET (?countryLabel := smf:setLanguage(?arg1, "en"))
?country rdfs:label ?countryLabel.
?country <http://www.topbraid.org/owl/geo/region#capital> ?capital.
?capital rdfs:label ?cap .
FILTER ( lang(?cap) = "en" )
LET (?capitalLabel := smf:setLanguage(?cap, ""))}
As mentioned above, the imports follows automatically with a prefix convertion
in the statement as a consequence.
Very happy with that, it makes the statement more readable, but...
For one or another reason, the triples for the predicate capital of the source
file are
generated with the predicate Capital (yes, literally capitalized ;-)).
We have thus to adjust the automatically converted select statement as follows
to make him run:
SELECT ?capitalLabel
WHERE {
LET (?countryLabel := smf:setLanguage(?arg1, "en")) .
?country rdfs:label ?countryLabel .
?country region:Capital ?capital .
?capital rdfs:label ?cap .
FILTER (lang(?cap) = "en") .
LET (?capitalLabel := smf:setLanguage(?cap, "")) .
}
This might be a new feature.
Without this adaptation, the script does not return the capital.
Page 28, point 14
The answer in the web-browser on the input request is:
HTTP ERROR: 404
Not FoundRequestURI=/tbl/servlet
Powered by Jetty://
Should there be anything else to activate ?
Page 29, point 3 in par 6.1
3. With ImportCountries class selected, drag and drop sparql:constructor
property on to the form.
I didn't find a sparql:constructor, but with the spin:constructor, it worked
fine.
Suppose this is a rather new feature.
Hope this was of some help for others who try to finish the exercises too.
Kind regards
Eddy Vanderlinden.
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