code: @Nonnull
    @ReturnsMutableCopy
    public static ICommonsList <SVRLFailedAssert> getAllFailedAssertions (@Nullable final SchematronOutputType aSchematronOutput)
    {
      final ICommonsList <SVRLFailedAssert> ret = new CommonsArrayList <> ();
      if (aSchematronOutput != null)
        for (final Object aObj : aSchematronOutput.getActivePatternAndFiredRuleAndFailedAssert ())
          if (aObj instanceof FailedAssert)
            ret.add (new SVRLFailedAssert ((FailedAssert) aObj));
      return ret;
    }
docs: Get a list of all failed assertions in a given schematron output.
  
  @param aSchematronOutput
  The schematron output to be used. May be <code>null</code>.
  @return A non-<code>null</code> list with all failed assertions.