private static final Escaper HTML_ESCAPER =
      Escapers.builder()
          .addEscape('"', """)
          // Note: "'" is not defined in HTML 4.01.
          .addEscape('\'', "'")
          .addEscape('&', "&")
          .addEscape('<', "&lt;")
          .addEscape('>', "&gt;")
          .build();

  private HtmlEscapers() {}

</p>
<pre class="grammar">
+    &amp;     +=    &amp;=     &amp;&amp;    ==    !=    (    )
-    |     -=    |=     ||    &lt;     &lt;=    [    ]
*    ^     *=    ^=     &lt;-    &gt;     &gt;=    {    }
/    &lt;&lt;    /=    &lt;&lt;=    ++    =     :=    ,    ;
%    &gt;&gt;    %=    &gt;&gt;=    --    !     ...   .    :
     &amp;^          &amp;^=          ~
</pre>

 *     this.entry = entry;
 *   }
 *   public E getEntry() { return entry; }
 *   public int compareTo(FIFOEntry<E> other) {
 *     int res = entry.compareTo(other.entry);
 *     if (res == 0 && other.entry != this.entry)
 *       res = (seqNum < other.seqNum ? -1 : 1);
 *     return res;
 *   }
 * }</pre>
 *
 * @author Doug Lea
 * @author Justin T. Sampson

     */
    protected String colonStr = "_CLN_";

    /**
     * A string to replace ;.
     */
    protected String semicolonStr = "_SCLN_";

    /**
     * A string to replace &.
     */
    protected String ampersandStr = "_AMP_";

    protected int maxDuplicatedPath = 100;

    protected String charsetName = Constants.UTF_8;

    /**
     * A directory to store downloaded files.

    private static final String END_HTML_COMMENT = "-->";
    private static final Map<String, String> ENTITIES = new HashMap<String, String>();

    static {
        ENTITIES.put("amp", "&");
        ENTITIES.put("lt", "<");
        ENTITIES.put("gt", ">");
        ENTITIES.put("quot", "\"");
        ENTITIES.put("apos", "'");
    }

    private final JavadocScanner scanner;

 * general way.
 *
 * <p>A good example of usage of this class is for HTML escaping where the replacement array
 * contains information about the named HTML entities such as {@code &amp;} and {@code &quot;} while
 * {@link #escapeUnsafe} is overridden to handle general escaping of the form {@code &#NNNNN;}.
 *
 * <p>The size of the data structure used by {@link ArrayBasedUnicodeEscaper} is proportional to the

            case '<':
                buf.append("&lt;");
                break;
            case '>':
                buf.append("&gt;");
                break;
            case '&':
                buf.append("&amp;");
                break;
            case '"':
                buf.append("&quot;");
                break;
            default:
                buf.append(element);
            }
        }

     * @throws IOException Model read problem
     */
    @Test
    void testUrls() throws Exception {
        testInheritance("urls");
    }

    /**
     * Flat directory structure: parent & child POMs in sibling directories, child directory == artifactId.
     * @throws IOException Model read problem
     */
    @Test
    void testFlatUrls() throws IOException {
        testInheritance("flat-urls");
    }

    private XmlUtil() {
    }

    public static String escapeXml(final String value) {
        return stripInvalidXMLCharacters(//
                value//
                        .replace("&", "&") //
                        .replace("<", "&lt;")//
                        .replace(">", "&gt;")//
                        .replace("\"", "&quot;")//
                        .replace("\'", "&apos;")//
        );
    }

        builder.addEscape(c, "\uFFFD");
      }
    }

    // Build the content escaper first and then add quote escaping for the
    // general escaper.
    builder.addEscape('&', "&");
    builder.addEscape('<', "&lt;");
    builder.addEscape('>', "&gt;");
    XML_CONTENT_ESCAPER = builder.build();
    builder.addEscape('\'', "&apos;");
    builder.addEscape('"', "&quot;");