▁is ▁not ▁to ▁ins cribe , ▁the ▁property ▁may ▁not ▁be ▁presented ▁again . ▁When ▁additional ▁information ▁is ▁needed ▁the ▁nom ination ▁will ▁be ▁referred ▁( para ▁ 1 5 9 ) ▁or ▁de ferred ▁( para ▁ 1 6 0 ) ▁for ▁more ▁in ▁depth ▁assess ment ▁or ▁study . ▁▁▁ ▁The ▁Gu idel ines ▁also ▁reve al ▁when ▁conditions ▁for ▁delet ion ▁( Ch apter ▁IV . C ▁) ▁of ▁a ▁World ▁Heritage ▁Site ▁apply . ▁e . g . ▁Dresden ▁El be ▁Valley , ▁and ▁what ▁steps ▁are ▁to ▁be ▁taken ▁to ▁ensure ▁for ▁the ▁long - term ▁protection ▁and ▁conservation ▁of ▁UN ES CO ▁sites . ▁ ▁Re quire ments ▁ ▁To ▁make ▁sure ▁that ▁a ▁World ▁Heritage ▁Site ▁is ▁protected ▁and ▁transm itted ▁to ▁future ▁gener ations , ▁the ▁Oper ational ▁Gu idel ines ▁give ▁directions ▁to ▁a ▁more ▁effective ▁long - term ▁conservation ▁system ▁i . e . ▁a ▁periodic ▁reporting ▁( Ch apter ▁ 5 ▁The ▁World ▁Heritage ▁Committee ▁has ▁adopted ▁the ▁Format ▁and ▁Ex plan atory ▁Notes ▁to ▁be ▁found ▁in ▁Anne x ▁ 7 . ▁State ▁Part ies ▁are ▁invited ▁to ▁submit ▁Period ic ▁reports ▁every ▁six ▁years . ▁The ▁World ▁Heritage ▁Committee ▁following ▁the ▁table ▁set ▁in ▁paragraph ▁ 2 0 3 ▁C ▁will ▁examine ▁the ▁reports . ▁The ▁format ▁consists ▁of ▁two ▁Se ctions . ▁Section ▁I ▁refers ▁to ▁the ▁legisl ative ▁and ▁administrative ▁prov isions ▁while ▁section ▁II ▁refers ▁to ▁the ▁state ▁of ▁conservation ▁of ▁specific ▁World ▁Heritage ▁properties ▁located ▁on