<!ELEMENT window_catalog (

<!ELEMENT window (

<!ELEMENT manufacturer ( #PCDATA ) >,

<!ELEMENT Type ( #PCDATA ) >,

<!ELEMENT Frame ( #PCDATA ) >,

<!ELEMENT U-Value ( #PCDATA ) >,

<!ELEMENT Number_of_Panes ( #PCDATA ) >,

<!ELEMENT Insulating_Gas ( #PCDATA ) >,

<!ELEMENT Glass_type ( #PCDATA ) >,

<!ELEMENT Interior_Finish ( #PCDATA ) >,

<!ELEMENT Exterior_Finish ( #PCDATA ) > )> )>,