import java.io.Serializable;

/**
 * The Sitemap interface represents a sitemap entity with location and last modification date.
 * It extends the Serializable interface to allow sitemap objects to be serialized.
 */
public interface Sitemap extends Serializable {

    /**
     * Retrieves the location (URL) of the sitemap.
     *
     * @return the location of the sitemap as a String.
     */
    String getLoc();

<?xml version="1.0" encoding="UTF-8"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
   <sitemap>
      <loc>http://www.example.com/sitemap1.xml.gz</loc>
      <lastmod>2004-10-01T18:23:17+00:00</lastmod>
   </sitemap>
   <sitemap>
      <loc>http://www.example.com/sitemap2.xml.gz</loc>
      <lastmod>2005-01-01</lastmod>
   </sitemap>

        // Test handling of duplicate URLs in sitemap
        ResponseData responseData = new ResponseData();
        byte[] content = "<sitemap></sitemap>".getBytes();
        responseData.setResponseBody(content);

        SitemapUrl sitemap1 = new SitemapUrl();
        sitemap1.setLoc("https://example.com/duplicate");

        SitemapUrl sitemap2 = new SitemapUrl();
        sitemap2.setLoc("https://example.com/duplicate");

                        + "  </sitemap>\n" + "  <sitemap>\n" + "    <lastmod>2025-01-02</lastmod>\n" + "  </sitemap>\n" + "  <sitemap>\n"
                        + "    <loc>http://www.example.com/sitemap2.xml</loc>\n" + "  </sitemap>\n" + "</sitemapindex>";
        final InputStream in = new ByteArrayInputStream(xml.getBytes());
        final SitemapSet sitemapSet = sitemapsHelper.parse(in);
        final Sitemap[] sitemaps = sitemapSet.getSitemaps();

        responseData.setResponseBody(file, false);
        return responseData;
    }

    private ResponseData getTestData3_OK() {
        final ResponseData responseData = new ResponseData();
        responseData.setUrl("http://example.com/sitemap.txt");
        File file = ResourceUtil.getResourceAsFile("sitemaps/sitemap1.txt");
        responseData.setResponseBody(file, false);
        return responseData;
    }

User-agent: Bot1
User-agent: Bot2
User-agent: Bot3
Disallow: /shared/

# Case 11: Sitemap with various formats
Sitemap: http://example.com/sitemap.xml
sitemap: http://example.com/sitemap2.xml
SITEMAP: http://example.com/sitemap3.xml
Sitemap:    # empty sitemap (should be ignored)
Sitemap: not-a-valid-url

# Case 12: Malformed lines that should be completely ignored
This line is completely invalid
:NoKey

    }

    /**
     * Adds a sitemap to this set.
     * @param sitemap the sitemap to add
     */
    public void addSitemap(final Sitemap sitemap) {
        sitemapList.add(sitemap);
    }

    /**
     * Removes a sitemap from this set.
     * @param sitemap the sitemap to remove
     */
    public void removeSitemap(final Sitemap sitemap) {
        sitemapList.remove(sitemap);
    }

    /**

            final Set<RequestData> requestDataSet = new LinkedHashSet<>();
            for (final Sitemap sitemap : sitemapSet.getSitemaps()) {
                if (sitemap != null) {
                    requestDataSet.add(RequestDataBuilder.newRequestData().get().url(sitemap.getLoc()).build()); // TODO priority
                }
            }

        robotsTxt.addSitemap("https://example.com/sitemap.xml");
        robotsTxt.addSitemap("https://example.com/sitemap2.xml");

        String[] sitemaps = robotsTxt.getSitemaps();
        assertEquals(2, sitemaps.length);
        assertEquals("https://example.com/sitemap.xml", sitemaps[0]);
        assertEquals("https://example.com/sitemap2.xml", sitemaps[1]);
    }

    public void test_addSitemapNoDuplicates() {

/**
 * Represents a URL entry within a sitemap.
 *
 * <p>
 * This class encapsulates the properties of a URL as defined in the sitemap XML format,
 * including its location, last modification date, change frequency, and priority.
 * It also supports sitemap extensions such as images, videos, news, and alternate links.
 * It implements the {@link Sitemap} interface.
 * </p>
 *
 * <p>