code: public boolean getIsXml() {
  
          if (m_isXml == null) {
              m_isXml = Boolean.valueOf(
                  CmsResourceTypeXmlPage.isXmlPage(this) || CmsResourceTypeXmlContent.isXmlContent(this));
          }
          return m_isXml.booleanValue();
      }
docs: Returns <code>true</code> in case this resource is an XML content.<p>
  
  @return <code>true</code> in case this resource is an XML content