diff --git a/.github/workflows/ant.yml b/.github/workflows/ant.yml
index 96c12c7..21a5f93 100644
--- a/.github/workflows/ant.yml
+++ b/.github/workflows/ant.yml
@@ -16,19 +16,20 @@ jobs:
 
     steps:
     - name: checkout TPTP-ANTLR
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: checkout SigmaUtils
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: 'ontologyportal/SigmaUtils'
+#        repository: 'terry-norbraten/SigmaUtils'
         ref: 'main'
 
     - name: Set up JDK 11
-      uses: actions/setup-java@v3
+      uses: actions/setup-java@v4
       with:
         java-version: '11'
         distribution: 'temurin'
 
     - name: Build with Ant
-      run: ant -noinput -buildfile build.xml
+      run: ant
diff --git a/.gitignore b/.gitignore
index 3c6ef0d..3baffe2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ lib
 
 build/
 tptp.jar
+/nbproject/private/
diff --git a/build.xml b/build.xml
index 2d8a26e..32abdce 100644
--- a/build.xml
+++ b/build.xml
@@ -2,7 +2,6 @@
         name="TPTP" default="all" basedir=".">
 
     <property name="ivy.install.version" value="2.5.1"/>
-
     <property name="ivy.home" value="${basedir}/.ivy"/>
     <property name="ivy.jar.dir" value="${ivy.home}/lib"/>
     <property name="ivy.jar.file" value="${ivy.jar.dir}/ivy.jar"/>
@@ -10,12 +9,17 @@
     <property name="app.name" value="tptpAntlr"/>
     <property name="build.home" value="build"/>
     <property name="build.classes" value="${build.home}/classes"/>
-    <property name="build.lib" value="${build.home}/lib"/>
+    <!--<property name="build.lib" value="${build.home}/lib"/>-->
     <property environment="env"/>
     <property name="build.test.classes" value="${build.home}/test-classes"/>
 
-    <target name="download-ivy" unless="offline">
+    <property name="javac.release" value="11"/>
+
+    <target name="check.for.ivy.jar">
+        <available file="${ivy.jar.file}" property="ivy.present"/>
+    </target>
 
+    <target name="download-ivy" depends="check.for.ivy.jar" unless="ivy.present">
         <mkdir dir="${ivy.jar.dir}"/>
         <!-- download Ivy from web site so that it can be used even without any special installation -->
         <get src="https://repo1.maven.org/maven2/org/apache/ivy/ivy/${ivy.install.version}/ivy-${ivy.install.version}.jar"
@@ -29,7 +33,6 @@
                 Ivy is in at least one of Ant's lib dir or the local lib dir. -->
         <path id="ivy.lib.path">
             <fileset dir="${ivy.jar.dir}" includes="*.jar"/>
-
         </path>
         <taskdef resource="org/apache/ivy/ant/antlib.xml"
                  uri="antlib:org.apache.ivy.ant" classpathref="ivy.lib.path"/>
@@ -40,10 +43,6 @@
         <echo>Java Version via Ant: ${ant.java.version}</echo>
         <echo>Java Version System Prop: ${java.version}</echo>
 
-        <!-- avoid problems with package name changes by deleting everything -->
-        <delete includeemptydirs="true" failonerror="false">
-            <fileset dir="${build.home}"/>
-        </delete>
         <ant antfile="../SigmaUtils/build.xml" inheritAll="false" target="all"/>
         <copy todir="${basedir}/lib" file="../SigmaUtils/sigmaUtils.jar"/>
         <ivy:retrieve/>
@@ -51,13 +50,18 @@
 
     <target name="compile" depends="init" description="Compile the project and place in ${build.classes}.">
         <mkdir dir="${build.classes}"/>
-        <javac destdir="${build.classes}" debug="on" optimize="on" deprecation="on" includeantruntime="false"
-               classpathref="compile.classpath">
+        <javac destdir="${build.classes}"
+               debug="on"
+               optimize="on"
+               deprecation="on"
+               includeantruntime="false"
+               classpathref="compile.classpath"
+               release="${javac.release}">
             <src refid="core.sourcepath"/>
         </javac>
-        <copy todir="${build.lib}">
+<!--        <copy todir="${build.lib}">
             <fileset dir="${basedir}/lib"/>
-        </copy>
+        </copy>-->
     </target>
 
     <path id="core.sourcepath">
@@ -103,7 +107,7 @@
     </target>
 
     <!-- target name="all" depends="dist, api_doc" -->
-    <target name="all" depends="compile, test">
+    <target name="all" depends="clean,test">
         <jar destfile="${basedir}/tptp.jar">
             <fileset dir="${build.classes}"/>
         </jar>
@@ -113,4 +117,17 @@
         <echo>the system date/time is ${TODAY_US}</echo>
     </target>
 
+    <target name="clean" description="Delete old build, lib, dist aritifacts">
+        <delete includeemptydirs="true" failonerror="false">
+            <!-- avoid problems with package name changes by deleting everything -->
+            <fileset dir="${build.home}"/>
+        </delete>
+        <delete file="tptp.jar"/>
+        <delete includeemptydirs="true" failonerror="false"> <!-- keep local ivy lib up to date -->
+            <fileset dir="${basedir}/lib"> <!-- keep ./lib -->
+                <include name="*.jar"/>
+            </fileset>
+        </delete>
+    </target>
+
 </project>
diff --git a/ivy.xml b/ivy.xml
index 9827ecc..5deec86 100644
--- a/ivy.xml
+++ b/ivy.xml
@@ -1,7 +1,14 @@
 <ivy-module version="2.0">
     <info organisation="org.ontologyportal" module="TPTP-ANTRL"/>
+    <configurations>
+        <conf name="api" description="Provide API"/>
+        <conf name="test" extends="api" visibility="private" description="For testing our API"/>
+    </configurations>
+    <publications>
+        <artifact name="filter-api" type="jar" conf="api" ext="jar"/>
+    </publications>
     <dependencies>
-        <dependency org="org.antlr" name="antlr4" rev="4.9.3"/>
-        <dependency org="junit" name="junit" rev="4.12"/>
+        <dependency org="org.antlr" name="antlr4" rev="4.9.3" conf="api->default"/>
+        <dependency org="junit" name="junit" rev="4.13.2" conf="test->default"/>
     </dependencies>
 </ivy-module>
\ No newline at end of file
diff --git a/nbproject/project.xml b/nbproject/project.xml
new file mode 100644
index 0000000..2f02da6
--- /dev/null
+++ b/nbproject/project.xml
@@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://www.netbeans.org/ns/project/1">
+    <type>org.netbeans.modules.ant.freeform</type>
+    <configuration>
+        <general-data xmlns="http://www.netbeans.org/ns/freeform-project/1">
+            <!-- Do not use Project Properties customizer when editing this file manually.
+ To prevent the customizer from showing, create nbproject/project.properties file and enter
+auxiliary.show.customizer=false
+property there. Adding
+auxiliary.show.customizer.message=<message>
+ will show your customized message when someone attempts to open the customizer.  -->
+            <name>TPTP</name>
+            <properties/>
+            <folders>
+                <source-folder>
+                    <label>src/java</label>
+                    <type>java</type>
+                    <location>src/java</location>
+                </source-folder>
+                <source-folder>
+                    <label>test/src/main/java</label>
+                    <type>java</type>
+                    <location>test/src/main/java</location>
+                </source-folder>
+            </folders>
+            <ide-actions>
+                <action name="build">
+                    <target>all</target>
+                </action>
+                <action name="test">
+                    <target>test</target>
+                </action>
+                <action name="rebuild">
+                    <target>compile</target>
+                </action>
+            </ide-actions>
+            <export>
+                <type>folder</type>
+                <location>build/classes</location>
+                <build-target>compile</build-target>
+            </export>
+            <export>
+                <type>folder</type>
+                <location>build/test-classes/tptp_parser</location>
+                <build-target>compile</build-target>
+            </export>
+            <view>
+                <items>
+                    <source-folder style="packages">
+                        <label>src/java</label>
+                        <location>src/java</location>
+                    </source-folder>
+                    <source-folder style="packages">
+                        <label>test/src/main/java</label>
+                        <location>test/src/main/java</location>
+                    </source-folder>
+                    <source-file>
+                        <location>build.xml</location>
+                    </source-file>
+                </items>
+                <context-menu>
+                    <ide-action name="build"/>
+                    <ide-action name="rebuild"/>
+                    <ide-action name="test"/>
+                </context-menu>
+            </view>
+        </general-data>
+        <java-data xmlns="http://www.netbeans.org/ns/freeform-project-java/5">
+            <compilation-unit>
+                <package-root>src/java</package-root>
+                <classpath mode="compile">lib/antlr-runtime-3.5.2.jar:lib/antlr4-4.9.3.jar:lib/antlr4-runtime-4.9.3.jar:lib/icu4j-69.1.jar:lib/javax.json-1.0.4.jar:lib/org.abego.treelayout.core-1.0.3.jar:lib/sigmaUtils.jar:lib/ST4-4.3.1.jar</classpath>
+                <built-to>build/classes</built-to>
+                <source-level>11</source-level>
+            </compilation-unit>
+            <compilation-unit>
+                <package-root>test/src/main/java</package-root>
+                <unit-tests/>
+                <classpath mode="compile">build/classes:lib/antlr-runtime-3.5.2.jar:lib/antlr4-4.9.3.jar:lib/antlr4-runtime-4.9.3.jar:lib/hamcrest-core-1.3.jar:lib/icu4j-69.1.jar:lib/javax.json-1.0.4.jar:lib/junit-4.13.2.jar:lib/org.abego.treelayout.core-1.0.3.jar:lib/sigmaUtils.jar:lib/ST4-4.3.1.jar</classpath>
+                <built-to>build/test-classes/tptp_parser</built-to>
+                <source-level>11</source-level>
+            </compilation-unit>
+        </java-data>
+    </configuration>
+</project>