* KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.internal.impl.model;

import java.net.URI;
import java.nio.file.Path;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;

 *   private Set<Uri> visited;
 *   private Queue<Uri> toCrawl;
 *   protected void startUp() throws Exception {
 *     toCrawl = readStartingUris();
 *   }
 *
 *   protected void runOneIteration() throws Exception {
 *     Uri uri = toCrawl.remove();
 *     Collection<Uri> newUris = crawl(uri);
 *     visited.add(uri);
 *     for (Uri newUri : newUris) {

     */
    @Nonnull
    InputStream openStream() throws IOException;

    /**
     * Provides a user-friendly hint about the location of the source.
     * This could be a local file path, a URI or just an empty string.
     * The intention is to assist users during error reporting.
     *
     * @return a user-friendly hint about the location of the source, never {@code null}
     */
    @Nonnull

        handleReactorDependencies(context, model, path, builder);
        handleCiFriendlyVersion(context, model, path, builder);
        return builder.build();
    }

    //
    // Infer modelVersion from namespace URI
    //
    void handleModelVersion(ModelTransformerContext context, Model model, Path pomFile, Model.Builder builder) {
        String namespace = model.getNamespaceUri();

        is.setSystemId("include.xml");
        parser.parse(is, new DefaultHandler() {

            @Override
            public void startElement(final String uri, final String localName, final String qName, final Attributes attributes)
                    throws SAXException {
                if ("bar".equals(qName)) {
                    included = true;
                }
            }

    }

    @Override
    public void endDocument() throws SAXException {
        globalParams.clear();
        tagQueue.clear();
    }

    @Override
    public void startElement(final String uri, final String localName, final String qName, final Attributes attributes)
            throws SAXException {
        if (logger.isDebugEnabled()) {
            logger.debug("Start Element: {}", qName);
        }

    /** The key of the message: {item} cannot convert as {propertyType}. */
    public static final String CONSTRAINTS_TypeAny_MESSAGE = "{constraints.TypeAny.message}";

    /** The key of the message: {item} has wrong URI. */
    public static final String CONSTRAINTS_UriType_MESSAGE = "{constraints.UriType.message}";

    /** The key of the message: {item} is invalid cron expression. */

    // The expressions help a lot, but we need a clean to pick up a directory of POMs, automatically load
    // them into a resolver, create the expression to extract the data to validate the Model, and the URI
    // to validate the properties. We also need a way to navigate from the Tex specification documents to
    // the test in question and vice versa. A little Eclipse plugin would do the trick.

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