Add comment for reproducible builds

See https://maven.apache.org/guides/mini/guide-reproducible-builds.html

commons-rdf-api/pom.xml

@@ -36,6 +36,7 @@
     <properties>
       <commons.parent.dir>${basedir}/..</commons.parent.dir>
       <commons.osgi.symbolicName>org.apache.commons.rdf.api</commons.osgi.symbolicName>
+      <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
       <project.build.outputTimestamp>2024-02-01T03:27:02Z</project.build.outputTimestamp>
     </properties>
 

commons-rdf-examples/pom.xml

@@ -35,6 +35,7 @@
         <commons.parent.dir>${basedir}/..</commons.parent.dir>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
+        <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
         <project.build.outputTimestamp>2024-02-01T03:27:02Z</project.build.outputTimestamp>
         <commons.rdf.version>0.5.0</commons.rdf.version> <!-- update to latest version -->
     </properties>

commons-rdf-integration-tests/pom.xml

@@ -29,6 +29,7 @@
 	<name>Commons RDF Integration tests</name>
     <properties>
         <commons.parent.dir>${basedir}/..</commons.parent.dir>
+        <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
         <project.build.outputTimestamp>2024-02-01T03:27:02Z</project.build.outputTimestamp>
     </properties>
 	<dependencies>

commons-rdf-jsonld-java/pom.xml

@@ -34,6 +34,7 @@
     <description>Parser integration of JSON-LD Java</description>
     <properties>
         <commons.parent.dir>${basedir}/..</commons.parent.dir>
+        <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
         <project.build.outputTimestamp>2024-02-01T03:27:02Z</project.build.outputTimestamp>
     </properties>
 

commons-rdf-rdf4j/pom.xml

@@ -34,6 +34,7 @@
 	<description>Eclipse RDF4j implementation of Commons RDF API</description>
     <properties>
         <commons.parent.dir>${basedir}/..</commons.parent.dir>
+        <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
         <project.build.outputTimestamp>2024-02-01T03:27:02Z</project.build.outputTimestamp>
     </properties>
 

commons-rdf-simple/pom.xml

@@ -41,6 +41,7 @@
     </distributionManagement>
     <properties>
         <commons.parent.dir>${basedir}/..</commons.parent.dir>
+        <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
         <project.build.outputTimestamp>2024-02-01T03:27:02Z</project.build.outputTimestamp>
     </properties>
 

pom.xml

@@ -42,6 +42,7 @@
         <maven.compiler.source>11</maven.compiler.source>
         <maven.compiler.target>11</maven.compiler.target>
         <project.build.encoding>UTF-8</project.build.encoding>
+        <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
         <project.build.outputTimestamp>2024-02-01T03:27:02Z</project.build.outputTimestamp>
         <commons.parent.dir>${basedir}</commons.parent.dir>
         <commons.encoding>UTF-8</commons.encoding>