2025-01-25 rdf | Clojure Slack Archive

rdf 2025-01-25

2025-01-25T00:27:16.772889Z

I have a Turtle file that looks like this, generated using Donatello:

@prefix rdf: <> .
@prefix rdfs: <> .
@prefix ent: <tag:acme.com/initrode/pd/mm/id/e/> .
@prefix attr: <tag:acme.com/initrode/pd/mm/id/a/> .

ent:1efd782a-47b7-6790-8487-440cb3ab6e31 attr:paths "0101, 1010";
                                         attr:sop_ref_id 12345;
                                         attr:build "";
                                         attr:vendor "ACME";
                                         attr:cat 1;
                                         attr:project_code 8675309;
                                         attr:number "C2187";
                                         attr:pattern_type "p1x1";
                                         attr:elastic "no".

Trying to read this in with Raphael, I get errors about ; Prefix char starts with illegal character "<any of my objects/values above, does not matter>" Looking at the examples of generating Turtle files in the Donatello docs, I can't see what is problematic with what got generated here. The Raphael reader fails in this check: https://github.com/quoll/raphael/blob/main/src/quoll/raphael/core.cljc#L368 It's like it is expecting the values to be prefixed with an IRI and I am hoping someone spots something basic I am misunderstanding about how to generate the Turtle file (leading to it being unreadable).

2025-01-25T22:00:12.525149Z

A bit more on this. I am taking the Turtle generated by Donatello and trying to convert it to different formats using https://www.easyrdf.org/converter. As posted above, that web apps errors with *Error!* $resource should be either IRI, blank-node identifier or EasyRdf\Resource. got empty string So I added this prefix at the top of my file @base <> . and get the same error. But when I put into the Base URI field of the conversion input, then the conversion works as expected (the Turtle contents can be read and converted to JSON-LD or whatever). So I am guessing the issue is needing to apply some kind of IRI to the string literals I have as my values/objects. I am going to look into the typed-literal function in Donatello...

quoll 2025-01-26T21:02:29.464249Z

Can you file an issue on the Raphael GitHub project, please? I’ll try to look at this today

quoll 2025-01-26T22:18:43.104389Z

Hmmm, I'm having trouble replicating this

quoll 2025-01-26T22:23:50.599119Z

I've added the following to test/quoll/raphael/doc_test.cljc

(def document27
  "@prefix rdf: <> .
@prefix rdfs: <> .
@prefix ent: <tag:acme.com/initrode/pd/mm/id/e/> .
@prefix attr: <tag:acme.com/initrode/pd/mm/id/a/> .

ent:1efd782a-47b7-6790-8487-440cb3ab6e31 attr:paths \"0101, 1010\";
                                         attr:sop_ref_id 12345;
                                         attr:build \"\";
                                         attr:vendor \"ACME\";
                                         attr:cat 1;
                                         attr:project_code 8675309;
                                         attr:number \"C2187\";
                                         attr:pattern_type \"p1x1\";
                                         attr:elastic \"no\".")

(deftest document27-test
  (testing "Parsing of example27 document"
    (let [{:keys [base namespaces triples]} (parse document27)
          main-node (keyword "ent" "1efd782a-47b7-6790-8487-440cb3ab6e31")]
      (is (nil? base))
      (is (= namespaces {"rdf" ""
                         "rdfs" ""
                         "ent" "tag:"
                         "attr" "tag:
      (is (= (simplify triples)
             [[main-node :attr/paths "0101, 1010"]
              [main-node :attr/sop_ref_id 12345]
              [main-node :attr/build ""]
              [main-node :attr/vendor "ACME"]
              [main-node :attr/cat 1]
              [main-node :attr/project_code 8675309]
              [main-node :attr/number "C2187"]
              [main-node :attr/pattern_type "p1x1"]
              [main-node :attr/elastic "no"]])))))

The call to (simplify triples) converts IRIs to keywords.

quoll 2025-01-26T22:25:01.660339Z

This test works correctly.

quoll 2025-01-26T22:32:19.558869Z

Are you using the latest version?

quoll 2025-01-27T00:39:07.892059Z

I did discover that IRIs were not printing in a CIDER repl, because this tries to use clojure.pprint/write, which writes map-like objects by converting them to a seq, and IRI had not implemented the Seqable interface. I've been through all the interfaces that I didn't think IRIs needed to implement, and ensured that there is an method there for everything, so now it prints better in Cider. This is a new version of Raphael: 0.3.11

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rdf 2025-01-25