code: protected void deleteContentValue(CmsXmlContent content, Locale locale, String path) {
  
          boolean hasValue = content.hasValue(path, locale);
          if (hasValue) {
              int index = CmsXmlUtils.getXpathIndexInt(path) - 1;
              I_CmsXmlContentValue val = content.getValue(path, locale);
              if (index >= val.getMinOccurs()) {
                  content.removeValue(path, locale, index);
              } else {
                  val.setStringValue(m_cms, "");
              }
          }
      }
docs: Deletes the given value path from the content document.<p>
  
  @param content the content document
  @param locale the content locale
  @param path the value XPath