Import error

Mikael

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Apr 2, 2020, 7:30:22 AM4/2/20

to HermiT Users

Hi,

I'm trying to import XML OWL file from Manchester file:

Ontology: <http://example.com/ont1>

Import: <http://localhost/schema/owl1.xml>

owl1.xml:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE rdf:RDF>

...

but get error

Parser: OWLXMLParser

org.xml.sax.SAXParseException; systemId: http://localhost/schema/kb.openrobots.org.owl; lineNumber: 1; columnNumber: 50; White spaces are required between publicId and systemId.

...

Parser: ManchesterOWLSyntaxOntologyParser

Encountered '<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">' at line 1 column 1. Expected either 'Ontology:' or 'Prefix:' (Line 1)

at uk.ac.manchester.cs.owl.owlapi.ParsableOWLOntologyFactory.loadOWLOntology(ParsableOWLOntologyFactory.java:236)

at uk.ac.manchester.cs.owl.owlapi.OWLOntologyManagerImpl.loadOntology(OWLOntologyManagerImpl.java:880)

at uk.ac.manchester.cs.owl.owlapi.OWLOntologyManagerImpl.loadOntology(OWLOntologyManagerImpl.java:800)

at uk.ac.manchester.cs.owl.owlapi.OWLOntologyManagerImpl.loadImports(OWLOntologyManagerImpl.java:1278)

at uk.ac.manchester.cs.owl.owlapi.OWLOntologyManagerImpl.makeLoadImportRequest(OWLOntologyManagerImpl.java:1309)

This error also comes whether the imported file exists on not. Any ideas what could be wrong here?

Mikael

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Apr 2, 2020, 7:40:22 AM4/2/20

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This error seems to occur independent of what the imported file is.

Ignazio Palmisano

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Apr 2, 2020, 7:54:12 AM4/2/20

to Mikael, HermiT Users

Hi,

As seen in the stack trace, the import resolves to a web page, not an owl file. Possibly a 400 page?

However, Manchester syntax is not XML, so either the file extension or the expected language are wrong - I'd expect the content to be owl/XML or rdf/XML, not Manchester syntax.

Cheers,

Ignazio

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Mikael

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Apr 2, 2020, 8:05:35 AM4/2/20

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That was the reason, localhost was responding 301. Now I get this error:

Exception in thread "main" java.lang.NullPointerException

at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseOntology(ManchesterOWLSyntaxEditorParser.java:2607)

at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxOntologyParser.parse(ManchesterOWLSyntaxOntologyParser.java:125)

at uk.ac.manchester.cs.owl.owlapi.ParsableOWLOntologyFactory.loadOWLOntology(ParsableOWLOntologyFactory.java:206)

at uk.ac.manchester.cs.owl.owlapi.OWLOntologyManagerImpl.loadOntology(OWLOntologyManagerImpl.java:880)

at uk.ac.manchester.cs.owl.owlapi.OWLOntologyManagerImpl.loadOntology(OWLOntologyManagerImpl.java:800)

at uk.ac.manchester.cs.owl.owlapi.OWLOntologyManagerImpl.loadOntology(OWLOntologyManagerImpl.java:758)

at org.semanticweb.HermiT.cli.CommandLine.main(Unknown Source)

Tried importing XML, Manchester. And if there is a syntax error, parser correctly shows the error, but when errors are fixed, above stack is shown. And this comes only when importing another file.

On Thursday, 2 April 2020 14:30:22 UTC+3, Mikael wrote:

Ignazio Palmisano

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Apr 2, 2020, 8:36:50 AM4/2/20

to Mikael, HermiT Users

Can you raise this as an issue on the owlapi tracker, including the content of the import that's failing?

I don't think it's a HermiT issue.

Cheers,

Ignazio

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Mikael

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Apr 2, 2020, 9:05:25 AM4/2/20

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Created https://github.com/owlcs/owlapi/issues/921

Thanks for help!

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