jena | Apache Jena , a Java framework | Machine Learning library
kandi X-RAY | jena Summary
kandi X-RAY | jena Summary
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Top functions reviewed by kandi - BETA
- Begins the scanner until the next regular expression matches
- Computed surrogate pair
- Determines if a Unicode character is compatible with the given code point
- Show a specific code point
- Sets the designated parameter
- Converts a node to a boolean
- Sets the value of an RDF term
- Converts a node to a boolean
- Start scanning until the next regular expression matches
- Fills the input buffer
- Execute a POST container
- Defines an entity definition
- Reads a tuple definition
- Entry point for testing
- Blocking read
- Tokenizes and returns the next token
- Gets the text index
- Adds a duration to an instance
- Initialize writer factory
- Process module definitions
- Creates the dispatch table
- Moves the scanner until the next regular expression matches
- Start scanning and return the next token
- Creates all supported schema types
- Implementation of the standardScheme read method
- Entry point for testing purposes
- Moves to the next batch
jena Key Features
jena Examples and Code Snippets
Community Discussions
Trending Discussions on jena
QUESTION
I'm trying to get Jena ARQ as suggested in O'Reilly SPARQL 1.1 book so I can follow along with the query examples in the book. I've downloaded apache-jena-.4.0.zip from jena.apache.org/download/index.cgi and follwed the instructions to extract and set JENA_HOME and PATH environmet variables.
When I run ARQ.bat from windows cmd terminal I get
...ANSWER
Answered 2022-Mar-19 at 18:04Class file version 55.0 is equivalent to Java 11 (can be seen for example here). However, the Java version you install from java.com is Java 8. Therefore you need to use at least Java 11, but newer versions (e.g. Java 17) might work as well.
You can obtain newer versions of the Oracle JDK here, or you can use Open JDK builds, for example from here. See for example this question for differences between the Oracle JDK and Open JDK.
QUESTION
Summary: I am trying to use the documentation on JavaScript SPARQL Functions to get a minimal working example of calling a custom javascript function, but it results in a scriptEngine null error.
Details: I setup a fuseki environment following the Docker instructions, so:
...ANSWER
Answered 2022-Mar-10 at 10:28In Apache Jena 3.16.0, the JS engine was Nashorn. Nashorn was deprecated in Java 11 and removed in Java17.
An earlier Java version will have Hashorn in.
Now Jena version 4.4.0 uses the javascript engine of choice which has been added to the classpath, and hence needs to be in the dockerfile. Jena testing uses GraalVM.
QUESTION
What would be a good and simple way to block implicit location mapping loading in Jena?
In other words, if there are files with the following patterns found:
...ANSWER
Answered 2022-Feb-17 at 23:17Call LocationMapper.setGlobalLocationMapper before any Jena operation is invoked (specifically, before JenaSystem.init happens, and that happens via class statics on all API ways into Jena).
Example:
QUESTION
I am using Triple Store called Apache Jena Fuseki for storing the RDF as input But the thing is that i have data in CSV format. I researched a lot but didn't find direct way to convert CSV to RDF but there is tarql tool which is command line tool that can do the job but the thing is that i need a python script that directly converts my CSV to RDF form.
I have used the tools like openRefine and tarql but i need python script to do this job and i have read somewhere that owlready2 tool also used to convert CSV to RDF but when i used to visit the official site then i found that they are using OWL file for this work.
Thanks!
...ANSWER
Answered 2022-Feb-05 at 16:46CSVW - CSV on the Web - is a W3C Recommendation for this. There is a python implementation.
Or you can run "tarql" from python by forking a subprocess.
QUESTION
I'm using the PostgreSQL database and attempting to display details from the database in a JSP page using a data table. The issue here it displays only the database information but pagination, sorting and searching features are not getting implemented for the data table. I have looked for solutions but it still doesn't work.
...ANSWER
Answered 2022-Jan-25 at 06:52You should write the first table like this format because data table follow this format:
QUESTION
I'm newbie in Go and practicing, could you please help to convert a map to an html table in GO? I have a function that fetches some data from some rest end points and return a map that can vary in size based on the result I get back from the endpoints.
...ANSWER
Answered 2022-Jan-14 at 19:44The easiest way in my opinion is to use the html/template package. The docs of text/template explain the syntax, in case you are not familiar with the templating engine.
Like so (playground link):
QUESTION
I have the following SPARQL query on a Owl Ontology, using Jena:
...ANSWER
Answered 2022-Jan-04 at 16:25Per the very informative answer of UninformedUser:
QUESTION
I have an owl/rdf schema with object properties with range restrictions, and I'm unable to get with the Jena API the effective range class.
I would like to get the classes which are defined in the ontology as the range of a property. For example, with the following schema:
...ANSWER
Answered 2021-Dec-15 at 15:11Per the useful comments above, it now works. I'm doing:
QUESTION
I have created an OWL ontology using Protégé, describing a patient database system. I am now attempting to develop a Java code using Apache Jena to read the OWL file I created, then perform a number of operations on it. My primary goal is to get my code to be able to find a specific Individual by name (Patient name for example) and then access a specific Object Property for that individual, and output its value. For example, A patient "John" has an object property "Treated_By" which corresponds to another individual "Amy" (Amy is an individual of type doctor). However, I have been unable to figure out which Jena method is used to retrieve Object property values from a certain individual.
Here is my code (Please ignore comments, they are fragments of previous attempts for this task):
...ANSWER
Answered 2021-Dec-08 at 21:50Try this (replace the property URI accordingly):
QUESTION
I would like to make a SPARQL query using MAKG (Microsoft Academic Knowledge Graph) (https://makg.org/) and DBPedia datasets (using SERVICE keyword) on Apache Jena Fuseki.
Before that, I want to test some simpler queries for just MAKG such as:
...ANSWER
Answered 2021-Dec-06 at 23:07The makg.org server is Virtuoso which uses RDF 1.0 for data so "hydrogen"^^xsd:string != "hydrogen".
Apache Jena Fuseki uses RDF 1.1 where "hydrogen"^^xsd:string is the same as "hydrogen" .
The problem is that the query sent is sending "hydrogen" because it is reconstructing the query service-part into a string using RDF 1.1 abbreviations.
The way round this using Fuseki is to use a filter.
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Install jena
You can use jena like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the jena component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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