[
https://issues.apache.org/jira/browse/JENA-2187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17435280#comment-17435280
]
Andy Seaborne commented on JENA-2187:
-------------------------------------
[~phtyson] -- The {{person-eg.jsonld}} case is different.
The JSON-LD engine, Titanium, does not expose the results of parsing the
{{\@context}} to Jena.
What Jena does is to get the JSON document, find the global {{@context}} and
extract the prefixes. It does not, at this point, do a full processing of the
context. Instead, it looks for {{"prefix" : "uri"}} pairs by traversing the
JSON, where "uri" ends in "/", "#" or ":". Jena also interprest {{\@vocab}} and
an URI with one of those ending as the "" prefix.
I've logged a feature request with Titanium:
https://github.com/filip26/titanium-json-ld/issues/193 to ask for the context
prefixes be exposed after JSON-LD parsing.
> LangJSONLD11 doesn't extract prefixes from context array or URL reference
> -------------------------------------------------------------------------
>
> Key: JENA-2187
> URL: https://issues.apache.org/jira/browse/JENA-2187
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 4.2.0
> Reporter: Paul Tyson
> Priority: Minor
> Attachments: jena-2187-fail.jsonld11, jena-2187-pass.jsonld11,
> person-eg.jsonld
>
>
> Using riot cmdline, when processing a json-ld @context that is an array, I
> get the following message, and the prefixes are not emitted in the ttl output.
> {code:java}
> 10:46:02 WARN LangJSONLD11 :: Unexpected problem while extracting
> prefixes: Cannot cast org.glassfish.json.JsonArrayBuilderImpl$JsonArrayImpl
> to jakarta.json.JsonObject
> java.lang.ClassCastException: Cannot cast
> org.glassfish.json.JsonArrayBuilderImpl$JsonArrayImpl to
> jakarta.json.JsonObject
> at java.lang.Class.cast(Class.java:3605) ~[?:?]
> at jakarta.json.JsonValue.asJsonObject(JsonValue.java:117)
> ~[jakarta.json-2.0.1.jar:2.0.1]
> at
> org.apache.jena.riot.lang.LangJSONLD11.extractPrefixes(LangJSONLD11.java:97)
> [jena-arq-4.2.0.jar:4.2.0]
> at org.apache.jena.riot.lang.LangJSONLD11.read(LangJSONLD11.java:75)
> [jena-arq-4.2.0.jar:4.2.0]
> at org.apache.jena.riot.lang.LangJSONLD11.read(LangJSONLD11.java:55)
> [jena-arq-4.2.0.jar:4.2.0]
> at org.apache.jena.riot.RDFParser.read(RDFParser.java:358)
> [jena-arq-4.2.0.jar:4.2.0]
> at org.apache.jena.riot.RDFParser.parseURI(RDFParser.java:324)
> [jena-arq-4.2.0.jar:4.2.0]
> at org.apache.jena.riot.RDFParser.parse(RDFParser.java:299)
> [jena-arq-4.2.0.jar:4.2.0]
> at riotcmd.CmdLangParse.parseRIOT(CmdLangParse.java:297)
> [jena-cmds-4.2.0.jar:4.2.0]
> at riotcmd.CmdLangParse.parseFile(CmdLangParse.java:251)
> [jena-cmds-4.2.0.jar:4.2.0]
> at riotcmd.CmdLangParse.exec$(CmdLangParse.java:163)
> [jena-cmds-4.2.0.jar:4.2.0]
> at riotcmd.CmdLangParse.exec(CmdLangParse.java:128)
> [jena-cmds-4.2.0.jar:4.2.0]
> at org.apache.jena.cmd.CmdMain.mainMethod(CmdMain.java:92)
> [jena-cmds-4.2.0.jar:4.2.0]
> at org.apache.jena.cmd.CmdMain.mainRun(CmdMain.java:58)
> [jena-cmds-4.2.0.jar:4.2.0]
> at org.apache.jena.cmd.CmdMain.mainRun(CmdMain.java:45)
> [jena-cmds-4.2.0.jar:4.2.0]
> at riotcmd.riot.main(riot.java:29) [jena-cmds-4.2.0.jar:4.2.0]
> {code}
> If the context is a JSON object, no warning message appears, and the prefixes
> are included in the output.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
