/**
     * Merges values from the specified parent model into the given child model. Implementations are expected to keep
     * parent and child completely decoupled by injecting deep copies of objects into the child rather than the original
     * objects from the parent.
     *
     * @param child The child model into which to merge the values inherited from the parent, must not be
     *            <code>null</code>.

public class ElementWarningsRenderer {
    public void renderTo(DslElementDoc elementDoc, String type, Element parent) {
        if (elementDoc.isDeprecated()) {
            Document document = parent.getOwnerDocument();
            Element caution = document.createElement("caution");
            parent.appendChild(caution);
            Element para = document.createElement("para");
            caution.appendChild(para);

            <root>
                <mxCell id="0"/>
                <mxCell id="1" parent="0"/>
                <mxCell id="2" value="" style="rounded=0;whiteSpace=wrap;html=1;fontStyle=1;strokeWidth=4;" parent="1" vertex="1">
                    <mxGeometry x="450" y="-50" width="820" height="970" as="geometry"/>
                </mxCell>

        Model parent = getModel(baseName + "-parent");

        Model child = getModel(baseName + "-child");

        if (fromRepo) {
            // when model is read from repo, a stream is used, then pomFile == null
            // (has consequences in inheritance algorithm since getProjectDirectory() returns null)
            parent = Model.newBuilder(parent, true).pomFile(null).build();

            <root>
                <mxCell id="0"/>
                <mxCell id="1" parent="0"/>
                <mxCell id="2" value="" style="rounded=0;whiteSpace=wrap;html=1;fontStyle=1;strokeWidth=4;" parent="1" vertex="1">
                    <mxGeometry x="110" y="280" width="1350" height="620" as="geometry"/>
                </mxCell>

     */
    ModelResolver newCopy();

    default ModelSource resolveModel(Parent parent, AtomicReference<Parent> modified)
            throws UnresolvableModelException {
        org.apache.maven.model.Parent p = new org.apache.maven.model.Parent(parent);
        ModelSource result = resolveModel(p);
        if (p.getDelegate() != parent) {
            modified.set(p.getDelegate());
        }
        return result;
    }

            <root>
                <mxCell id="0"/>
                <mxCell id="1" parent="0"/>
                <mxCell id="2" value="" style="rounded=0;whiteSpace=wrap;html=1;fontStyle=1;strokeWidth=4;" parent="1" vertex="1">
                    <mxGeometry x="450" y="-50" width="820" height="970" as="geometry"/>
                </mxCell>

            <parent>child</parent>
            <child>child</child>
            <parent-only>parent</parent-only>
          </defaults>
          <appends combine.children="append">
            <parent-only>parent</parent-only>
            <parent>parent</parent>
            <parent>child</parent>
            <child>child</child>
          </appends>

                }
                int parent = idx - 1;
                while (parent >= 0 && result.charAt(parent) == '/') {
                    parent--;
                }
                parent = result.lastIndexOf('/', parent);
                if (parent < 0) {
                    result = result.substring(idx + 4);
                } else {
                    result = result.substring(0, parent) + result.substring(idx + 3);

        }

        @Override
        public Object[] toArray() {
            return parent.toArray();
        }

        @Override
        public <T> T[] toArray(final T[] a) {
            return parent.toArray(a);
        }

        @Override
        public boolean add(final E e) {
            return parent.add(e);
        }

        @Override