From:  http://www.rets-wg.org/docs/retsdtd.txt
Date:  1999-05-24

<?xml version="1.0"?>
<!--   Real Estate Transaction Specification (RETS) DTD  -->
<!--   Real Estate Transaction Markup Language (RETML)  -->
<!--   
	submitted by:
	Dan Musso
	WyldFyre Technologies, Inc.
	DRAFT Document Version 1.0  05/11/1999
-->

<!ELEMENT ResidentialProperty (Listing, Rooms?, Occupant?)>
<!ATTLIST ResidentialProperty 
	Bedrooms  CDATA #REQUIRED
	Baths  CDATA #REQUIRED
	Subdivision  CDATA #IMPLIED
	AssociationFee  CDATA #IMPLIED
	SquareFootage  CDATA #IMPLIED
	LotSize  CDATA #IMPLIED
	Parking  CDATA #IMPLIED
	Stories  CDATA #IMPLIED
	YearBuilt  CDATA #IMPLIED
	Heating  CDATA #IMPLIED
	Cooling  CDATA #IMPLIED
	Pool  CDATA #IMPLIED
	InteriorFeatures  CDATA #IMPLIED
	ExteriorFeatures  CDATA #IMPLIED
	Type  CDATA #IMPLIED 
>

<!ELEMENT CommonInterest (ResidentialProperty)>
<!ATTLIST CommonInterest 
	BuildingType  CDATA #REQUIRED
	TotalUnits  CDATA #REQUIRED
	BuildingName  CDATA #IMPLIED
	ComplexFeatures  CDATA #IMPLIED
	Ownership  CDATA #IMPLIED
	>

<!ELEMENT LotsAndLand (Listing)>
<!ATTLIST LotsAndLand 
	Acreage  CDATA #REQUIRED
	Zoning  CDATA #REQUIRED
	Utilities  CDATA #IMPLIED
	PresentUse  CDATA #IMPLIED
	Topography  CDATA #IMPLIED
	ParcelAccess  CDATA #IMPLIED
	DevelopmentStatus  CDATA #IMPLIED
	ExistingStructures  CDATA #IMPLIED
	>

<!ELEMENT MultiFamily (CommonInterest)>
<!ATTLIST MultiFamily 
	AnnualRent  CDATA #REQUIRED
	AnnualGross  CDATA #REQUIRED
	AnnualExpenses  CDATA #REQUIRED
	NetIncome  CDATA #REQUIRED
	VacancyFactor  CDATA #IMPLIED
	TenantPays CDATA #IMPLIED
	OwnerPays CDATA #IMPLIED
	Laundry CDATA #IMPLIED
	>

<!ELEMENT Listing (StreetAddress, ListingData, MLSInformation, GeographicData, SalesData?, SchoolData?, TaxData?, PictureData*)>
<!ATTLIST Listing 	
	ModificationTimestamp  CDATA #REQUIRED
	ListingID  CDATA #REQUIRED
	ParcelNumber  CDATA #IMPLIED
	View  CDATA #IMPLIED
	>

<!ELEMENT GeographicData (#PCDATA)>
<!ATTLIST GeographicData 	
	Latitude  CDATA #REQUIRED
	Longitude  CDATA #REQUIRED
	County  CDATA #IMPLIED
	Directions  CDATA #IMPLIED
	MapCoordinate  CDATA #IMPLIED
	MapURL  CDATA #IMPLIED
	>

<!ELEMENT SchoolData (#PCDATA)>
<!ATTLIST SchoolData 	
	ElementarySchool  CDATA #IMPLIED
	MiddleSchool  CDATA #IMPLIED
	HighSchool  CDATA #IMPLIED
	>

<!ELEMENT TaxData (StreetAddress, MailingAddress)>
<!ATTLIST TaxData 	
	TaxID  CDATA #REQUIRED
	ModificationTimestamp  CDATA #IMPLIED
	LegalDescription  CDATA #IMPLIED
	OwnersName  CDATA #IMPLIED
	AssessedValuation  CDATA #IMPLIED
	PropertyZoning  CDATA #IMPLIED
	ParcelMapURL  CDATA #IMPLIED
	>

<!ELEMENT PictureData (#PCDATA)>
<!ATTLIST PictureData 	
	PictureID  CDATA #IMPLIED
	ModificationTimestamp  CDATA #IMPLIED
	PictureURL  CDATA #REQUIRED
	PictureCaption  CDATA #IMPLIED
	>

<!ELEMENT REOffice (ContactInformation, StreetAddress)>
<!ATTLIST REOffice 	
	OfficeID  CDATA #IMPLIED
	NRDSOfficeID  CDATA #IMPLIED
	Name  CDATA #IMPLIED
	>

<!ELEMENT REAgent (ContactInformation, StreetAddress)>
<!ATTLIST REAgent 	
	AgentID  CDATA #IMPLIED
	NRDSMemberID  CDATA #IMPLIED
	Name  CDATA #IMPLIED
	>

<!ELEMENT REAgentInformation (REAgent, REOffice)>

<!ELEMENT Occupant (ContactInformation)>
<!ATTLIST Occupant 	
	Name  CDATA #IMPLIED
	>

<!ELEMENT ContactInformation (#PCDATA)>
<!ATTLIST ContactInformation 	
	OfficePhone  CDATA #IMPLIED
	CarPhone  CDATA #IMPLIED
	CellPhone  CDATA #IMPLIED
	HomePhone  CDATA #IMPLIED
	Pager  CDATA #IMPLIED
	Email  CDATA #IMPLIED
	WWW  CDATA #IMPLIED
	>

<!ELEMENT StreetAddress (#PCDATA)>
<!ATTLIST StreetAddress 	
	StreetNumber  CDATA #IMPLIED
	StreetDirPrefix  CDATA #IMPLIED
	StreetName  CDATA #IMPLIED
	StreetAdditionalInfo  CDATA #IMPLIED
	StreetDirSuffix  CDATA #IMPLIED
	StreetSuffix  CDATA #IMPLIED
	UnitNumber  CDATA #IMPLIED
	City  CDATA #IMPLIED
	State  CDATA #IMPLIED
	Country  CDATA #IMPLIED
	PostalCode  CDATA #IMPLIED
	CarrierRoute  CDATA #IMPLIED
	Unstructured  CDATA #IMPLIED
	>

<!ELEMENT MailingAddress (StreetAddress)>

<!ELEMENT ListingData (REAgent+, REOffice)>
<!ATTLIST ListingData 	
	ListDate  CDATA #REQUIRED
	ListPrice  CDATA #REQUIRED
	ExpirationDate  CDATA #IMPLIED
	ShowingInstructions  CDATA #IMPLIED
	ListingType  CDATA #IMPLIED
	Commission  CDATA #IMPLIED
	Remarks CDATA #IMPLIED
	PublicRemarks CDATA #IMPLIED
	>

<!ELEMENT SalesData (REAgent+, REOffice )>
<!ATTLIST SalesData 	
	SalesDate  CDATA #REQUIRED
	SalesPrice  CDATA #IMPLIED
	CloseDate  CDATA #IMPLIED
	>

<!ELEMENT MLSInformation (#PCDATA)>
<!ATTLIST MLSInformation 	
	StandardStatus  (Active | Pending | Closed | OffMarket ) #REQUIRED
	ListingStatus  CDATA #IMPLIED
	OriginalListPrice  CDATA #IMPLIED
	ListingArea  CDATA #IMPLIED
	StatusChangeDate  CDATA #IMPLIED
	DaysOnMarket  CDATA #IMPLIED
	>

<!ELEMENT RoomData (#PCDATA)>
<!ATTLIST RoomData
	Size  CDATA #IMPLIED
	>

<!ELEMENT DiningRoom (RoomData)>
<!ELEMENT LivingRoom (RoomData)>
<!ELEMENT FamilyRoom (RoomData)>
<!ELEMENT Basement (RoomData)>

<!ELEMENT Rooms (DiningRoom?, LivingRoom?, FamilyRoom?, Basement?)>