diff --git a/pom.xml b/pom.xml
index fc521a0..e2e2ff8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,229 +1,335 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-	<modelVersion>4.0.0</modelVersion>
-	<groupId>org.phenopackets</groupId>
-	<artifactId>phenopackets-api</artifactId>
-	<version>0.0.6-SNAPSHOT</version>
-	<packaging>jar</packaging>
-	<name>${project.groupId}:${project.artifactId}</name>
-	<description>Reference implementation for the Phenopackets specification</description>
-	<url>http://phenopackets.org</url>
-	<inceptionYear>2016</inceptionYear>
-	<licenses>
-		<license>
-			<name>The BSD 3-Clause License</name>
-			<url>https://opensource.org/licenses/BSD-3-Clause</url>
-			<distribution>repo</distribution>
-		</license>
-	</licenses>
-	<developers>
-		<developer>
-			<name>Chris Mungall</name>
-			<email>cjmungall@lbl.gov</email>
-			<organization>Monarch Initiative</organization>
-			<organizationUrl>http://monarchinitiative.org</organizationUrl>
-		</developer>
-		<developer>
-			<name>Jules Jacobsen</name>
-			<email>jj8@sanger.ac.uk</email>
-			<organization>Sanger Institute</organization>
-			<organizationUrl>http://sanger.ac.uk</organizationUrl>
-		</developer>
-	</developers>
-	<scm>
-		<connection>scm:git:https://github.com/phenopackets/phenopacket-reference-implementation.git</connection>
-		<developerConnection>scm:git:git@github.com:phenopackets/phenopacket-reference-implementation.git
-        </developerConnection>
-		<url>https://github.com/phenopackets/phenopacket-reference-implementation</url>
-		<tag>HEAD</tag>
-	</scm>
-	<ciManagement>
-		<system>Travis CI</system>
-		<url>https://travis-ci.org/phenopackets/phenopacket-reference-implementation</url>
-	</ciManagement>
+	 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>org.phenopackets</groupId>
+  <artifactId>phenopackets-api</artifactId>
+  <version>0.0.6-SNAPSHOT</version>
+  <packaging>jar</packaging>
+  <name>${project.groupId}:${project.artifactId}</name>
+  <description>Reference implementation for the Phenopackets specification</description>
+  <url>http://phenopackets.org</url>
+  <inceptionYear>2016</inceptionYear>
+  <licenses>
+    <license>
+      <name>The BSD 3-Clause License</name>
+      <url>https://opensource.org/licenses/BSD-3-Clause</url>
+      <distribution>repo</distribution>
+    </license>
+  </licenses>
+  <developers>
+    <developer>
+      <name>Chris Mungall</name>
+      <email>cjmungall@lbl.gov</email>
+      <organization>Monarch Initiative</organization>
+      <organizationUrl>http://monarchinitiative.org</organizationUrl>
+    </developer>
+    <developer>
+      <name>Jules Jacobsen</name>
+      <email>jj8@sanger.ac.uk</email>
+      <organization>Sanger Institute</organization>
+      <organizationUrl>http://sanger.ac.uk</organizationUrl>
+    </developer>
+  </developers>
+  <scm>
+    <connection>scm:git:https://github.com/phenopackets/phenopacket-reference-implementation.git</connection>
+    <developerConnection>scm:git:git@github.com:phenopackets/phenopacket-reference-implementation.git</developerConnection>
+    <url>https://github.com/phenopackets/phenopacket-reference-implementation</url>
+    <tag>HEAD</tag>
+  </scm>
+  <ciManagement>
+    <system>Travis CI</system>
+    <url>https://travis-ci.org/phenopackets/phenopacket-reference-implementation</url>
+  </ciManagement>
 
-	<properties>
-		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<java.version>1.8</java.version>
-	</properties>
+  <prerequisites>
+    <maven>3.0.4</maven>
+  </prerequisites>
+  <properties>
+    <java.version>1.8</java.version>
+    <maven.enforcer.jdk-version>[1.8,)</maven.enforcer.jdk-version>
+    <maven.enforcer.maven-version>[3.0.4,)</maven.enforcer.maven-version>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <project.build.targetEncoding>UTF-8</project.build.targetEncoding>
+  </properties>
 
-	<distributionManagement>
-		<snapshotRepository>
-			<id>ossrh</id>
-			<url>https://oss.sonatype.org/content/repositories/snapshots</url>
-		</snapshotRepository>
-	</distributionManagement>
+  <distributionManagement>
+    <snapshotRepository>
+      <id>ossrh</id>
+      <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+    </snapshotRepository>
+  </distributionManagement>
 
-	<profiles>
-		<profile>
-			<id>doclint-java8-disable</id>
-			<activation>
-				<jdk>[1.8,)</jdk>
-			</activation>
-			<build>
-				<plugins>
-					<plugin>
-						<groupId>org.apache.maven.plugins</groupId>
-						<artifactId>maven-javadoc-plugin</artifactId>
-						<configuration>
-							<additionalparam>-Xdoclint:none</additionalparam>
-						</configuration>
-					</plugin>
-				</plugins>
-			</build>
-		</profile>
-	</profiles>
+  <build>
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-clean-plugin</artifactId>
+          <version>3.0.0</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.5.1</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-deploy-plugin</artifactId>
+          <version>2.8.2</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-enforcer-plugin</artifactId>
+          <version>1.4.1</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-gpg-plugin</artifactId>
+          <version>1.6</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-install-plugin</artifactId>
+          <version>2.5.2</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-jar-plugin</artifactId>
+          <version>3.0.1</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-javadoc-plugin</artifactId>
+          <version>2.10.4</version>
+          <configuration>
+            <detectLinks>true</detectLinks>
+            <quiet>true</quiet>
+            <linksource>true</linksource>
+          </configuration>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-release-plugin</artifactId>
+          <version>2.5.3</version>
+          <configuration>
+            <autoVersionSubmodules>true</autoVersionSubmodules>
+            <useReleaseProfile>false</useReleaseProfile>
+            <releaseProfiles>release</releaseProfiles>
+            <goals>deploy</goals>
+          </configuration>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-resources-plugin</artifactId>
+          <version>3.0.1</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-site-plugin</artifactId>
+          <version>3.5.1</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-source-plugin</artifactId>
+          <version>3.0.1</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <version>2.19.1</version>
+        </plugin>
+        <plugin>
+	  <groupId>org.sonatype.plugins</groupId>
+	  <artifactId>nexus-staging-maven-plugin</artifactId>
+	  <version>1.6.7</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+    <plugins>
+      <plugin>
+	<groupId>org.apache.maven.plugins</groupId>
+	<artifactId>maven-compiler-plugin</artifactId>
+	<configuration>
+	  <source>${java.version}</source>
+	  <target>${java.version}</target>
+	</configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>enforce-java</id>
+            <goals>
+              <goal>enforce</goal>
+            </goals>
+            <configuration>
+              <rules>
+                <requireMavenVersion>
+                  <version>${maven.enforcer.maven-version}</version>
+                </requireMavenVersion>
+                <requireJavaVersion>
+                  <version>${maven.enforcer.jdk-version}</version>
+                </requireJavaVersion>
+              </rules>    
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+	<groupId>org.apache.maven.plugins</groupId>
+	<artifactId>maven-surefire-plugin</artifactId>
+      </plugin>
+    </plugins>
+  </build>
 
-	<build>
-		<plugins>
-			<plugin>
-				<groupId>org.sonatype.plugins</groupId>
-				<artifactId>nexus-staging-maven-plugin</artifactId>
-				<version>1.6.3</version>
-				<extensions>true</extensions>
-				<configuration>
-					<serverId>ossrh</serverId>
-					<nexusUrl>https://oss.sonatype.org/</nexusUrl>
-					<autoReleaseAfterClose>true</autoReleaseAfterClose>
-				</configuration>
-			</plugin>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-gpg-plugin</artifactId>
-				<version>1.5</version>
-				<executions>
-					<execution>
-						<id>sign-artifacts</id>
-						<phase>verify</phase>
-						<goals>
-							<goal>sign</goal>
-						</goals>
-					</execution>
-				</executions>
-			</plugin>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.1</version>
-				<configuration>
-					<source>${java.version}</source>
-					<target>${java.version}</target>
-				</configuration>
-			</plugin>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-surefire-plugin</artifactId>
-				<version>2.19</version>
-				<configuration>
-					<excludes>
-						<exclude>**/FooTest.java</exclude>
-					</excludes>
-				</configuration>
-			</plugin>
+  <dependencies>
+    <dependency>
+      <groupId>com.google.guava</groupId>
+      <artifactId>guava</artifactId>
+      <version>19.0</version>
+    </dependency>
+    <dependency>
+      <groupId>commons-io</groupId>
+      <artifactId>commons-io</artifactId>
+      <version>2.2</version>
+    </dependency>
+    <dependency>
+      <groupId>com.github.jsonld-java</groupId>
+      <artifactId>jsonld-java</artifactId>
+      <version>0.8.3</version>
+    </dependency>
+    <dependency>
+      <groupId>com.io-informatics.oss</groupId>
+      <artifactId>jackson-jsonld</artifactId>
+      <version>0.0.5</version>
+      <exclusions>
+	<exclusion>
+	  <artifactId>jackson-annotations</artifactId>
+	  <groupId>com.fasterxml.jackson.core</groupId>
+	</exclusion>
+	<exclusion>
+	  <artifactId>jackson-core</artifactId>
+	  <groupId>com.fasterxml.jackson.core</groupId>
+	</exclusion>
+	<exclusion>
+	  <artifactId>jackson-databind</artifactId>
+	  <groupId>com.fasterxml.jackson.core</groupId>
+	</exclusion>
+      </exclusions>
+    </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.dataformat</groupId>
+      <artifactId>jackson-dataformat-yaml</artifactId>
+      <version>2.5.4</version>
+    </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.module</groupId>
+      <artifactId>jackson-module-jsonSchema</artifactId>
+      <version>2.7.2</version>
+    </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.dataformat</groupId>
+      <artifactId>jackson-dataformat-protobuf</artifactId>
+      <version>2.7.2</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.jena</groupId>
+      <artifactId>apache-jena-libs</artifactId>
+      <type>pom</type>
+      <version>2.12.1</version>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.12</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.hamcrest</groupId>
+      <artifactId>hamcrest-core</artifactId>
+      <version>1.3</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>ch.qos.logback</groupId>
+      <artifactId>logback-classic</artifactId>
+      <version>1.1.7</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
 
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-source-plugin</artifactId>
-				<version>2.2.1</version>
-				<executions>
-					<execution>
-						<id>attach-sources</id>
-						<goals>
-							<goal>jar-no-fork</goal>
-						</goals>
-					</execution>
-				</executions>
-			</plugin>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-javadoc-plugin</artifactId>
-				<version>2.9.1</version>
-				<executions>
-					<execution>
-						<id>attach-javadocs</id>
-						<goals>
-							<goal>jar</goal>
-						</goals>
-					</execution>
-				</executions>
-			</plugin>
-
-		</plugins>
-	</build>
-
-	<dependencies>
-		<dependency>
-			<groupId>com.google.guava</groupId>
-			<artifactId>guava</artifactId>
-			<version>19.0</version>
-		</dependency>
-		<dependency>
-			<groupId>commons-io</groupId>
-			<artifactId>commons-io</artifactId>
-			<version>2.2</version>
-		</dependency>
-		<dependency>
-			<groupId>com.github.jsonld-java</groupId>
-			<artifactId>jsonld-java</artifactId>
-			<version>0.8.3</version>
-		</dependency>
-		<dependency>
-			<groupId>com.io-informatics.oss</groupId>
-			<artifactId>jackson-jsonld</artifactId>
-			<version>0.0.5</version>
-			<exclusions>
-				<exclusion>
-					<artifactId>jackson-annotations</artifactId>
-					<groupId>com.fasterxml.jackson.core</groupId>
-				</exclusion>
-				<exclusion>
-					<artifactId>jackson-core</artifactId>
-					<groupId>com.fasterxml.jackson.core</groupId>
-				</exclusion>
-				<exclusion>
-					<artifactId>jackson-databind</artifactId>
-					<groupId>com.fasterxml.jackson.core</groupId>
-				</exclusion>
-			</exclusions>
-		</dependency>
-		<dependency>
-			<groupId>com.fasterxml.jackson.dataformat</groupId>
-			<artifactId>jackson-dataformat-yaml</artifactId>
-			<version>2.5.4</version>
-		</dependency>
-		<dependency>
-			<groupId>com.fasterxml.jackson.module</groupId>
-			<artifactId>jackson-module-jsonSchema</artifactId>
-			<version>2.7.2</version>
-		</dependency>
-		<dependency>
-			<groupId>com.fasterxml.jackson.dataformat</groupId>
-			<artifactId>jackson-dataformat-protobuf</artifactId>
-			<version>2.7.2</version>
-		</dependency>
-		<dependency>
-			<groupId>org.apache.jena</groupId>
-			<artifactId>apache-jena-libs</artifactId>
-			<type>pom</type>
-			<version>2.12.1</version>
-		</dependency>
-		<dependency>
-			<groupId>junit</groupId>
-			<artifactId>junit</artifactId>
-			<version>4.12</version>
-			<scope>test</scope>
-		</dependency>
-		<dependency>
-			<groupId>org.hamcrest</groupId>
-			<artifactId>hamcrest-core</artifactId>
-			<version>1.3</version>
-			<scope>test</scope>
-		</dependency>
-		<dependency>
-			<groupId>ch.qos.logback</groupId>
-			<artifactId>logback-classic</artifactId>
-			<version>1.1.7</version>
-			<scope>test</scope>
-		</dependency>
-	</dependencies>
+  <profiles>
+    <profile>
+      <id>doclint-java8-disable</id>
+      <activation>
+	<jdk>[1.8,)</jdk>
+      </activation>
+      <build>
+	<plugins>
+	  <plugin>
+	    <groupId>org.apache.maven.plugins</groupId>
+	    <artifactId>maven-javadoc-plugin</artifactId>
+	    <configuration>
+	      <additionalparam>-Xdoclint:none</additionalparam>
+	    </configuration>
+	  </plugin>
+	</plugins>
+      </build>
+    </profile>
+    <profile>
+      <id>release</id>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-gpg-plugin</artifactId>
+            <executions>
+              <execution>
+                <id>sign-artifacts</id>
+                <phase>verify</phase>
+                <goals>
+                  <goal>sign</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-javadoc-plugin</artifactId>
+            <executions>
+              <execution>
+                <id>attach-javadocs</id>
+                <goals>
+                  <goal>jar</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-source-plugin</artifactId>
+            <executions>
+              <execution>
+                <id>attach-sources</id>
+                <goals>
+                  <goal>jar-no-fork</goal>
+                </goals>
+             </execution>
+            </executions>
+          </plugin>
+          <plugin>
+	    <groupId>org.sonatype.plugins</groupId>
+	    <artifactId>nexus-staging-maven-plugin</artifactId>
+	    <extensions>true</extensions>
+	    <configuration>
+	      <serverId>ossrh</serverId>
+	      <nexusUrl>https://oss.sonatype.org/</nexusUrl>
+	      <autoReleaseAfterClose>true</autoReleaseAfterClose>
+	    </configuration>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
 </project>