code: protected void parseAttribute(Token token) {
          // TODO this is a monster copy/paste - would be nicer to fix in the underlying library! :)
          token.setType(Type.ATTRIBUTE);
  
          parseName("attribute");
  
          if (pos == token.getStartOffset())
              throw new XMLParseException("Expected attribute name", source, pos);
  
          skipWhiteSpace();
          expect('=');
          skipWhiteSpace();
  
          char c = 0;
          if (pos < source.length())
              c = source.charAt(pos);
          if (c != '\'' && c != '"')
              throw new XMLParseException("Expected single or double quotes", source, pos);
  
          char endChar = c;
          boolean insideEntity = false;
          int errorPos = pos;
  
          while (true) {
              pos++;
              if (pos >= source.length()) {
                  int i = Math.min(20, source.length() - token.getStartOffset());
                  throw new XMLParseException("Missing end quote (" + endChar + ") of attribute: "
                          + lookAheadForErrorMessage(null, token.getStartOffset(), i), token);
              }
  
              c = source.charAt(pos);
              if (c == endChar)
                  break;
  
              if (c == '<')
                  throw new XMLParseException("Illegal character in attribute value: '" + c + "'", source, pos);
  
              if (c == '&') {
                  insideEntity = true;
                  errorPos = pos;
              } else if (c == ';') {
                  verifyEntity(errorPos, pos + 1);
                  insideEntity = false;
              } else {
                  String msg = charValidator.isValid(source, pos);
                  if (msg != null)
                      throw new XMLParseException("Illegal character found in attribute value. " + msg, source, pos);
  
                  skipChar(c);
                  pos--;
              }
          }
  
          if (insideEntity) {
              throw new XMLParseException("Missing ';' after '&': " + lookAheadForErrorMessage(null, errorPos, 20), source, errorPos);
          }
  
          // Skip end-char
          pos++;
      }
docs: Read the attribute of an element.
  <p>
  <p>The resulting token will contain the name, "=" plus the
  quotes and the value.