Lars-H/ICWS2022

Supplemental material of the paper "Utility-aware Semantics for Alternative Service Expressions in Federated SPARQL Queries" published at ICWS 2022.

"Utility-aware Semantics for Alternative Service Expressions in Federated SPARQL Queries" Supplemental Material - ICWS

This repository comprises the data for the supplemental material of the paper "Utility-aware Semantics for Alternative Service Expressions in Federated SPARQL Queries" published at ICWS 2022. This includes the scripts to generate queries under set and utility-aware semantics for the queries from FedBench. Furthermore, the quality descriptions as well as the resulting queries from the experimental study are provided as well.

Installation

The scripts are written in Python 3. The scripts require the packages numpy and pandas. Furthermore, as the queries are executed using the ARQ CLI , the binary must be available as well and set correctly when running the execute_query.py script.

Prepare Queries

The query preparation step creates the (optimized) SPARQL 1.1 queries for the query decompositions generated by FedX.

Example Usage

The script can be run using Python. Note that the ARQ CLI must be installed to run the script.

Create a SPARQL 1.1 under set semantics query from a decomposition:

 python3 prepare_query.py -d decompositions/type1/CD1_decomp.txt 
 -q quality_descriptions/1_qm/description_qm_1_v_1.json

Create a SPARQL 1.1 under utility-aware semantics query from a decomposition:

 python3 prepare_query.py -o -d decompositions/type1/CD1_decomp.txt 
 -q quality_descriptions/1_qm/description_qm_1_v_1.json

The option -v can be used to obtain more metadata about the query.

Get Help:

python3 prepare_query.py --help

Execute Queries

The query execution execute_query.py script is a simple interface to run queries using the ARQ CLI. It writes the results to a CSV File and also stores statistics about the execution.

Example Usage

The script can be run using Python. Note that the ARQ CLI must be installed to run the script.

Execute a query:

python3 execute_query.py -q queries/examples/example_query.rq 
-a ~/apache-jena-3.6.0/bin/arq

Get Help:

python3 execute_query.py --help

How to Cite

Lars Heling, Maribel Acosta. 
"Utility-aware Semantics for Alternative Service Expressions in Federated SPARQL Queries" 
IEEE International Conference On Web Services 2022.

License

This project is licensed under the MIT License.