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>

    @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

    </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>

            expressions.add("project.url");
            expressions.add("project.scm.url");
            expressions.add("project.scm.connection");
            expressions.add("project.scm.developerConnection");
            expressions.add("project.distributionManagement.site.url");
            URL_EXPRESSIONS = expressions;
        }

        private final UrlNormalizer normalizer;

        assertEquals("https://parent.url/scm/child", pom.getValue("scm/connection"));
        assertEquals("https://parent.url/scm/child", pom.getValue("scm/developerConnection"));
        assertEquals("https://parent.url/issues", pom.getValue("issueManagement/url"));
        assertEquals("https://parent.url/ci", pom.getValue("ciManagement/url"));

            ]]>
          </description>
          <type>String</type>
        </field>
        <field>
          <name>developerConnection</name>
          <version>4.0.0+</version>
          <description>
            <![CDATA[
            Just like {@code connection}, but for developers, i.e. this scm connection

    <prerequisites>
        <maven>3.0.4</maven>
    </prerequisites>

    <scm>
        <connection>scm:git:git://github.com/junit-team/junit4.git</connection>
        <developerConnection>scm:git:******@****.***:junit-team/junit4.git</developerConnection>
        <url>https://github.com/junit-team/junit4</url>
      <tag>r4.13.1</tag>
  </scm>
    <issueManagement>
        <system>github</system>