+ "<exportedPackage>c</exportedPackage>" + "</exportedPackages>" + "<exportedArtifacts>"
                + "<exportedArtifact>x</exportedArtifact>" + "<exportedArtifact>y</exportedArtifact>"
                + "<exportedArtifact> z </exportedArtifact>" + "</exportedArtifacts>" + "</extension>";

        ExtensionDescriptor ed = builder.build(toStream(xml));

        assertNotNull(ed);

        if (exportedArtifacts == null) {
            exportedArtifacts = new ArrayList<>();
        }

        return exportedArtifacts;
    }

    public void setExportedArtifacts(List<String> exportedArtifacts) {
        if (exportedArtifacts == null) {
            this.exportedArtifacts = null;
        } else {
            this.exportedArtifacts = new ArrayList<>(exportedArtifacts);
        }

        this(entry.getClassRealm(), entry.getExportedArtifacts(), entry.getExportedPackages());
    }

    public CoreExports(ClassRealm realm, Set<String> exportedArtifacts, Set<String> exportedPackages) {
        this.artifacts = Collections.unmodifiableSet(new HashSet<>(exportedArtifacts));
        this.packages = exportedPackages.stream()
                .collect(collectingAndThen(toMap(identity(), v -> realm), Collections::unmodifiableMap));
    }

          ]]></description>
        </field>
        <field>
          <name>exportedArtifacts</name>
          <version>1.0.0</version>
          <association>
            <type>String</type>
            <multiplicity>*</multiplicity>
          </association>

        }

        extensionDescriptor.setExportedPackages(parseStrings(dom.getChild("exportedPackages")));

        extensionDescriptor.setExportedArtifacts(parseStrings(dom.getChild("exportedArtifacts")));

        return extensionDescriptor;
    }

    private List<String> parseStrings(XmlNode dom) {
        List<String> strings = null;

        if (dom != null) {