code: private void _handleDiagnosticReferences (@Nullable final List <String> aSrcDiagnostics,
                                              @Nonnull final List <DiagnosticReference> aDstList,
                                              @Nonnull final PSXPathBoundAssertReport aBoundAssertReport,
                                              @Nonnull final Node aRuleMatchingNode) throws SchematronValidationException
    {
      if (CollectionHelper.isNotEmpty (aSrcDiagnostics))
      {
        if (m_aSchema.hasDiagnostics ())
        {
          final PSDiagnostics aDiagnostics = m_aSchema.getDiagnostics ();
          for (final String sDiagnosticID : aSrcDiagnostics)
          {
            final PSXPathBoundDiagnostic aDiagnostic = aBoundAssertReport.getBoundDiagnosticOfID (sDiagnosticID);
            if (aDiagnostic == null)
              _warn (aDiagnostics, "Failed to resolve diagnostics with ID '" + sDiagnosticID + "'");
            else
            {
              // Create the SVRL diagnostic-reference element
              final DiagnosticReference aDR = new DiagnosticReference ();
              aDR.setDiagnostic (sDiagnosticID);
              aDR.setText (_getErrorText (aDiagnostic.getAllBoundContentElements (), aRuleMatchingNode));
              aDstList.add (aDR);
            }
          }
        }
        else
          _warn (m_aSchema, "Failed to resolve diagnostic because schema has no diagnostics");
      }
    }
docs: Handle the diagnostic references of a single assert/report element
  
  @param aSrcDiagnostics
  The list of diagnostic reference IDs in the source assert/report
  element. May be <code>null</code> if no diagnostic references are
  present
  @param aDstList
  The diagnostic reference list of the SchematronOutput to be filled.
  May not be <code>null</code>.
  @param aBoundAssertReport
  The bound assert report element. Never <code>null</code>.
  @param aRuleMatchingNode
  The XML node of the XML document currently validated. Never
  <code>null</code>.
  @throws SchematronValidationException