@Override
    protected void mergeScm_DeveloperConnection(
            Scm.Builder builder, Scm target, Scm source, boolean sourceDominant, Map<Object, Object> context) {
        String src = source.getDeveloperConnection();
        if (src != null) {
            if (sourceDominant) {
                builder.developerConnection(src);
                builder.location("developerConnection", source.getLocation("developerConnection"));

 properties file could be used the specify $ so it can be interpolated in
 <developerConnection/> but you couldn't use a properties file to specify the
 version of your project say. Anyway, food for thought to begin with.

 - elements that are critical for pom dissemination
 - those that are used locally by the user like <developerConnection/>

* User configuration

	<organization>
		<name>CodeLibs Project</name>
		<url>http://www.codelibs.org/</url>
	</organization>
	<scm>
		<connection>scm:git:******@****.***:codelibs/curl4j.git</connection>
		<developerConnection>scm:git:******@****.***:codelibs/curl4j.git</developerConnection>
		<url>******@****.***:codelibs/curl4j.git</url>
	</scm>
	<parent>
		<groupId>org.sonatype.oss</groupId>
		<artifactId>oss-parent</artifactId>
		<version>9</version>
	</parent>

	</organization>
	<scm>
		<connection>scm:git:******@****.***:codelibs/corelib.git</connection>
		<url>scm:git:******@****.***:codelibs/corelib.git</url>
		<developerConnection>scm:git:******@****.***:codelibs/corelib.git</developerConnection>
	</scm>
	<parent>
		<groupId>org.sonatype.oss</groupId>
		<artifactId>oss-parent</artifactId>
		<version>9</version>
	</parent>
	<properties>

        if (scm != null) {
            builder.scm(Scm.newBuilder(scm)
                    .url(normalize(scm.getUrl()))
                    .connection(normalize(scm.getConnection()))
                    .developerConnection(normalize(scm.getDeveloperConnection()))
                    .build());
        }

        DistributionManagement dist = model.getDistributionManagement();
        if (dist != null) {

  <url>https://maven.apache.org/ref/${project.version}/${project.artifactId}</url>

  <scm>
    <connection>scm:git:https://gitbox.apache.org/repos/asf/maven.git</connection>
    <developerConnection>scm:git:https://gitbox.apache.org/repos/asf/maven.git</developerConnection>
    <tag>maven-4.0.0-alpha-10</tag>
    <url>https://github.com/apache/maven/tree/${project.scm.tag}/${project.artifactId}</url>
  </scm>
  <issueManagement>

			<distribution>repo</distribution>
		</license>
	</licenses>
	<scm>
		<connection>scm:git:******@****.***:codelibs/jcifs.git</connection>
		<developerConnection>scm:git:******@****.***:codelibs/jcifs.git</developerConnection>
		<url>https://github.com/codelibs/jcifs</url>
	</scm>
	<parent>
		<groupId>org.sonatype.oss</groupId>
		<artifactId>oss-parent</artifactId>
		<version>9</version>
	</parent>

    </license>
  </licenses>
  <scm>
    <connection>scm:svn:http://svn.apache.org/repos/asf/maven/components/tags/maven-2.0</connection>
    <developerConnection>scm:svn:https://svn.apache.org/repos/asf/maven/components/tags/maven-2.0</developerConnection>
    <url>http://svn.apache.org/viewcvs.cgi/maven/components/tags/maven-2.0</url>
  </scm>
  <organization>
    <name>Apache Software Foundation</name>

            distribution.set("repo")
          }
        }
        scm {
          connection.set("scm:git:https://github.com/square/okhttp.git")
          developerConnection.set("scm:git:ssh://******@****.***/square/okhttp.git")
          url.set("https://github.com/square/okhttp")
        }
        developers {
          developer {
            name.set("Square, Inc.")
          }

      <distribution>repo</distribution>
    </license>
  </licenses>
  <scm>
    <connection>scm:git:https://github.com/google/guava.git</connection>
    <developerConnection>scm:git:******@****.***:google/guava.git</developerConnection>
    <url>https://github.com/google/guava</url>
  </scm>
  <developers>
    <developer>
      <id>kevinb9n</id>
      <name>Kevin Bourrillion</name>