diff --git a/Makefile b/Makefile
index 4a51d21..c5009dd 100644
--- a/Makefile
+++ b/Makefile
@@ -33,7 +33,8 @@ TURTLE_FILELIST=$(shell ls ${ONTOLOGY_FOLDER_PATH}/*.ttl)
 # Widoco variables
 WIDOCO_RDF_INPUT_FILE_PATH?=test/reasoning-investigation/model-2020-12-16/ePO_restrictions.rdf
 WIDOCO_OUTPUT_FOLDER_PATH?=output/widoco
-NAMESPACES_AS_RDFPIPE_ARGS=$(shell ${MODEL2OWL_FOLDER}/scripts/get_namespaces.sh)
+NAMESPACES_XML_FILE_PATH?=${MODEL2OWL_FOLDER}/test/ePO-default-config/namespaces.xml
+NAMESPACES_AS_RDFPIPE_ARGS=$(shell ${MODEL2OWL_FOLDER}/scripts/get_namespaces.sh ${NAMESPACES_XML_FILE_PATH})
 RDF_XML_MIME_TYPE:='application/rdf+xml'
 TURTLE_MIME_TYPE:='turtle'
 
diff --git a/scripts/get_namespaces.sh b/scripts/get_namespaces.sh
index 7c26a70..a08e37e 100755
--- a/scripts/get_namespaces.sh
+++ b/scripts/get_namespaces.sh
@@ -1,15 +1,23 @@
 #!/bin/bash
 # 
-# Gets namespaces from namespaces.xml file and prepares argument
-# list from them to be used with `rdfpipe` tool.
-# Uses Saxon installed in the project main directory.
+# Gets namespaces from an XML file with the model2owl project namespaces
+# (`namespaces.xml` by default) and prepares argument list from them to be
+# used with `rdfpipe` tool. Uses Saxon installed in the project main directory.
+# 
+# USAGE: get_namespaces.sh NAMESPACES_XML_FILE_PATH
+
+if [ -z "$1" ]; then
+	echo "ERROR: path to *.xml file with namespaces not given."
+	exit 1
+fi
+namespaces_file_path="$1"
 
-PROJECT_DIR=$(dirname $(dirname $(realpath ${BASH_SOURCE[0]})))
-NAMESPACES_DIR=${PROJECT_DIR}/test/ePO-default-config
+namespaces_file_dir=$(dirname $(realpath $namespaces_file_path))
+namespaces_file_name=$(basename $namespaces_file_path)
 
-cd ${NAMESPACES_DIR}
+cd ${namespaces_file_dir}
 namespaces=$(
-    java -cp ../../saxon/saxon.jar net.sf.saxon.Query -s:namespaces.xml \
+    java -cp ../../saxon/saxon.jar net.sf.saxon.Query -s:${namespaces_file_name} \
 		-qs:'for $x in /*:prefixes/*:prefix return concat(string($x/@name), "=", string($x/@value))' \
 		\!method=text
 )