<!--   Real Estate Transaction Specification (RETS) Metadata DTD  -->
<!--
	submitted by:
	Leo Bijnagte
	Vista Information Solutions, Inc.
	Version 1.0  10/01/2000
	Version 1.5  10/15/2002 Bruce Toback
	Version 1.7  09/13/2004 Bruce Toback

    See http://www.rets.org for more information.
    
    This DTD is identified by PUBLIC and SYSTEM identifiers:
    
    PUBLIC "-//RETS//DTD Metadata Content 1.7//EN"
    SYSTEM "http://www.rets.org/dtd/2004/09/rets-metadata-content-1_7.dtd"
    
    ==========================================================================
    This material is provided AS-IS. The authors, copyright holders and
    standards-body contributors to this specification  (hereinafter
    "CONTRIBUTORS") make no representation or warranty, express or implied,
    including but not limited to warranties of merchantability, fitness for
    any purpose whatsoever, title or non-infringement; that the
    contents of this specification and its associated codes, documentation
    and ancillary materials are free from error, nor that these materials 
    will not infringe any third-party patents, copyrights, trademarks or
    other rights. In no event will CONTRIBUTORS be liable to any party for
    any direct, indirect, special or consequential damages for any use of
    this material, including without limitation lost profits, business
    interruption, loss of programs or other data on any information handling
    system, even if any of the CONTRIBUTORS, individually or otherwise, have
    been advised of the possibility of such damages.
    ==========================================================================
-->
<!-- EXTENSION ELEMENT -->
<!ELEMENT EXTENSION ANY >
<!ATTLIST EXTENSION
Version CDATA #REQUIRED
Container CDATA #REQUIRED
Content CDATA #REQUIRED >
<!-- PROPRIETARY ELEMENTS -->
<!ELEMENT PROPRIETARY (#PCDATA) >

<!-- BASIC ELEMENTS -->
<!ELEMENT MetadataEntryID (#PCDATA) >
<!ELEMENT StandardName (#PCDATA) >
<!ELEMENT VisibleName (#PCDATA) >
<!ELEMENT Description (#PCDATA) >
<!ELEMENT KeyField (#PCDATA)>
<!ELEMENT Value (#PCDATA)>

<!-- SYSTEM ELEMENTS -->
<!ELEMENT SystemDescription (#PCDATA)>
<!ELEMENT SystemID (#PCDATA)>
<!ELEMENT Comments (#PCDATA)>

<!-- RESOURCE ELEMENTS -->
<!ELEMENT ResourceID (#PCDATA) >
<!ELEMENT ClassCount (#PCDATA) >
<!ATTLIST ClassCount
Type CDATA #FIXED "INTEGER" >
<!ELEMENT ClassVersion (#PCDATA)>
<!ELEMENT ClassDate (#PCDATA)>
<!ELEMENT ObjectVersion (#PCDATA)>
<!ELEMENT ObjectDate (#PCDATA)>
<!ATTLIST ObjectDate
Type CDATA #FIXED "DATE-TIME"
Format CDATA #FIXED "YYYY-MM-DDThh:mm:ss[.sss]" >
<!ELEMENT SearchHelpVersion (#PCDATA)>
<!ELEMENT SearchHelpDate (#PCDATA)>
<!ATTLIST SearchHelpDate
Type CDATA #FIXED "DATE-TIME"
Format CDATA #FIXED "YYYY-MM-DDThh:mm:ss[.sss]" >
<!ELEMENT EditMaskVersion (#PCDATA)>
<!ELEMENT EditMaskDate (#PCDATA)>
<!ATTLIST EditMaskDate
Type CDATA #FIXED "DATE-TIME"
Format CDATA #FIXED "YYYY-MM-DDThh:mm:ss[.sss]" >
<!ELEMENT LookupVersion (#PCDATA)>
<!ELEMENT LookupDate (#PCDATA)>
<!ATTLIST LookupDate
Type CDATA #FIXED "DATE-TIME"
Format CDATA #FIXED "YYYY-MM-DDThh:mm:ss[.sss]" >
<!ELEMENT UpdateHelpVersion (#PCDATA)>
<!ELEMENT UpdateHelpDate (#PCDATA)> 
<!ATTLIST UpdateHelpDate
Type CDATA #FIXED "DATE-TIME"
Format CDATA #FIXED "YYYY-MM-DDThh:mm:ss[.sss]" >
<!ELEMENT ValidationExpressionVersion (#PCDATA)>
<!ELEMENT ValidationExpressionDate (#PCDATA)>
<!ATTLIST ValidationExpressionDate
Type CDATA #FIXED "DATE-TIME"
Format CDATA #FIXED "YYYY-MM-DDThh:mm:ss[.sss]" >
<!ELEMENT ValidationLookupVersion (#PCDATA)>
<!ELEMENT ValidationLookupDate (#PCDATA)>
<!ELEMENT ValidationExternalVersion (#PCDATA)>
<!ELEMENT ValidationExternalDate (#PCDATA)>
<!ATTLIST ValidationExternalDate
Type CDATA #FIXED "DATE-TIME"
Format CDATA #FIXED "YYYY-MM-DDThh:mm:ss[.sss]" >

<!-- CLASS ELEMENTS -->
<!ELEMENT ClassName (#PCDATA)>
<!ELEMENT TableVersion (#PCDATA)>
<!ELEMENT TableDate (#PCDATA)>
<!ATTLIST TableDate
Type CDATA #FIXED "DATE-TIME"
Format CDATA #FIXED "YYYY-MM-DDThh:mm:ss[.sss]" >
<!ELEMENT UpdateVersion (#PCDATA)>
<!ELEMENT UpdateDate (#PCDATA)>
<!ATTLIST UpdateDate
Type CDATA #FIXED "DATE-TIME"
Format CDATA #FIXED "YYYY-MM-DDThh:mm:ss[.sss]" >
<!ELEMENT ClassTimeStamp (#PCDATA)>     <!-- V1.7 -->
<!ELEMENT DeletedFlagField (#PCDATA)>   <!-- V1.7 -->
<!ELEMENT DeletedFlagValue (#PCDATA)>   <!-- V1.7 -->

<!-- TABLE ELEMENTS -->
<!ELEMENT SystemName (#PCDATA)>
<!ELEMENT LongName (#PCDATA)>
<!ELEMENT DBName (#PCDATA)>
<!ELEMENT ShortName (#PCDATA)>
<!ELEMENT MaximumLength (#PCDATA)>
<!ATTLIST MaximumLength
Type CDATA #FIXED "INTEGER" >
<!ELEMENT DataType (#PCDATA)>
<!ELEMENT Precision (#PCDATA)>
<!ATTLIST Precision
Type CDATA #FIXED "INTEGER" >
<!ELEMENT Searchable (#PCDATA)>
<!ELEMENT Interpretation (#PCDATA)>
<!ELEMENT Alignment (#PCDATA)>
<!ELEMENT UseSeparator (#PCDATA)>
<!ELEMENT EditMaskID (#PCDATA)>
<!ELEMENT LookupName (#PCDATA)>
<!ELEMENT MaxSelect (#PCDATA)>
<!ATTLIST MaxSelect
Type CDATA #FIXED "INTEGER" >
<!ELEMENT Units (#PCDATA)>
<!ELEMENT Index (#PCDATA)>
<!ELEMENT Minimum (#PCDATA)>
<!ATTLIST Minimum
Type CDATA #FIXED "INTEGER" >
<!ELEMENT Maximum (#PCDATA)>
<!ATTLIST Maximum
Type CDATA #FIXED "INTEGER" >
<!ELEMENT Default (#PCDATA)>
<!ELEMENT Required (#PCDATA)>
<!ATTLIST Required
Type CDATA #FIXED "INTEGER" >
<!ELEMENT SearchHelpID (#PCDATA)>
<!ELEMENT Unique (#PCDATA)>
<!ELEMENT ModTimeStampName (#PCDATA)> <!-- V1.7 -->
<!ELEMENT ForeignKeyName (#PCDATA)>   <!-- V1.7 -->
<!ELEMENT ForeignField (#PCDATA)>     <!-- V1.7 -->
<!ELEMENT KeyQuery (#PCDATA)>         <!-- V1.7 -->
<!ELEMENT KeySelect (#PCDATA)>        <!-- V1.7 -->

<!-- UPDATE ELEMENTS -->
<!ELEMENT UpdateName (#PCDATA)>
<!ELEMENT UpdateTypeVersion (#PCDATA)>
<!ELEMENT UpdateTypeDate (#PCDATA)>
<!ATTLIST UpdateTypeDate
Type CDATA #FIXED "DATE-TIME"
Format CDATA #FIXED "YYYY-MM-DDThh:mm:ss[.sss]" >

<!-- UPDATE_TYPE ELEMENTS -->
<!ELEMENT Sequence (#PCDATA)>
<!ELEMENT Attributes (#PCDATA)>
<!ELEMENT ValidationExpressionID (#PCDATA)>
<!ELEMENT UpdateHelpID (#PCDATA)>
<!ELEMENT ValidationLookupName (#PCDATA)>
<!ELEMENT ValidationExternalName (#PCDATA)>
<!ELEMENT MaxUpdate (#PCDATA)>      <!-- V1.7 -->

<!-- OBJECT ELEMENTS -->
<!ELEMENT ObjectType (#PCDATA)>
<!ELEMENT MimeType (#PCDATA)>
<!ELEMENT ObjectTimeStamp (#PCDATA)>   <!-- V1.7 -->
<!ELEMENT ObjectCount (#PCDATA)>       <!-- V1.7 -->

<!-- LOOKUP ELEMENTS -->
<!ELEMENT LookupTypeVersion (#PCDATA)>
<!ELEMENT LookupTypeDate (#PCDATA)>
<!ATTLIST LookupTypeDate
Type CDATA #FIXED "DATE-TIME"
Format CDATA #FIXED "YYYY-MM-DDThh:mm:ss[.sss]" >
<!-- LOOKUP_TYPE ELEMENTS -->
<!ELEMENT LongValue (#PCDATA)>
<!ELEMENT ShortValue (#PCDATA)>
<!-- VALIDATION_LOOKUP ELEMENTS -->
<!ELEMENT Parent1Field (#PCDATA)>
<!ELEMENT Parent2Field (#PCDATA)>
<!ELEMENT ValidationLookupTypeVersion (#PCDATA)>
<!ELEMENT ValidationLookupTypeDate (#PCDATA)>
<!ATTLIST ValidationLookupTypeDate
Type CDATA #FIXED "DATE-TIME"
Format CDATA #FIXED "YYYY-MM-DDThh:mm:ss[.sss]" >

<!--VALIDATION_LOOKUP_TYPE ELEMENTS -->
<!ELEMENT ValidText (#PCDATA)>
<!ELEMENT Parent1Value (#PCDATA)>
<!ELEMENT Parent2Value (#PCDATA)>
<!-- VALIDATION_EXPRESSION ELEMENTS -->
<!ELEMENT ValidationExpressionType (#PCDATA)>
<!-- VALIDATION_EXTERNAL ELEMENTS -->
<!ELEMENT SearchResource (#PCDATA)>
<!ELEMENT SearchClass (#PCDATA)>
<!ELEMENT ValidationExternalTypeVersion (#PCDATA)>
<!ELEMENT ValidationExternalTypeDate (#PCDATA)>
<!ATTLIST ValidationExternalTypeDate
Type CDATA #FIXED "DATE-TIME"
Format CDATA #FIXED "YYYY-MM-DDThh:mm:ss[.sss]" >

<!-- VALIDATION_EXTERNAL_TYPE ELEMENTS -->
<!ELEMENT SearchField (#PCDATA)>
<!ELEMENT DisplayField (#PCDATA)>
<!ELEMENT Source (#PCDATA)>
<!ELEMENT Target (#PCDATA)>

<!-- FOREIGN_KEY ELEMENTS -->
<!ELEMENT ForeignKeyID (#PCDATA)>
<!ELEMENT ParentResourceID (#PCDATA)>
<!ELEMENT ParentClassID (#PCDATA)>
<!ELEMENT ParentSystemName (#PCDATA)>
<!ELEMENT ChildResourceID (#PCDATA)>
<!ELEMENT ChildClassID (#PCDATA)>
<!ELEMENT ChildSystemName (#PCDATA)>
<!ELEMENT ConditionalParentField (#PCDATA)>  <!-- V1.7 -->
<!ELEMENT ConditionalParentValue (#PCDATA)>  <!-- V1.7 -->



<!ELEMENT METADATA (METADATA-SYSTEM? | METADATA-RESOURCE? | METADATA-CLASS+ | METADATA-TABLE+ | METADATA-UPDATE+ | METADATA-UPDATE_TYPE+ |  METADATA-OBJECT+ | METADATA-SEARCH_HELP+ | METADATA-UPDATE_HELP+ | METADATA-EDITMASK+ | 
METADATA-LOOKUP+ | METADATA-LOOKUP_TYPE+ | METADATA-VALIDATION_LOOKUP+ | METADATA-VALIDATION_LOOKUP_TYPE+ | METADATA-VALIDATION_EXPRESSION+ | 
METADATA-VALIDATION_EXTERNAL+ | METADATA-VALIDATION_EXTERNAL_TYPE+ | 
METADATA-FOREIGN_KEY? |PROPRIETARY+ | EXTENSION+)>
<!ELEMENT METADATA-SYSTEM (System)>
<!ATTLIST METADATA-SYSTEM
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT System ((SystemID) , (SystemDescription) , (Comments?) , METADATA-RESOURCE? , METADATA-FOREIGN_KEY? , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-RESOURCE (Resource+)>
<!ATTLIST METADATA-RESOURCE
        System CDATA #IMPLIED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT Resource (ResourceID , StandardName , VisibleName , Description , KeyField , ClassCount , ClassVersion , ClassDate , ObjectVersion , ObjectDate , SearchHelpVersion , SearchHelpDate , EditMaskVersion , EditMaskDate , LookupVersion , LookupDate , UpdateHelpVersion , UpdateHelpDate , ValidationExpressionVersion , ValidationExpressionDate , ValidationLookupVersion , ValidationLookupDate , ValidationExternalVersion , ValidationExternalDate , METADATA-CLASS* , METADATA-OBJECT? , METADATA-SEARCH_HELP? , METADATA-EDITMASK? , METADATA-LOOKUP? , METADATA-UPDATE_HELP? , METADATA-VALIDATION_LOOKUP? , METADATA-VALIDATION_EXPRESSION? , METADATA-VALIDATION_EXTERNAL? , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-FOREIGN_KEY (ForeignKey+)>
<!ELEMENT ForeignKey (ForeignKeyID , ParentResourceID , ParentClassID? ,
ParentSystemName , ChildResourceID , ChildClassID? , ChildSystemName, 
ConditionalParentField?, ConditionalParentValue?)>  <!-- V 1.7 -->
<!ELEMENT METADATA-CLASS (Class+)>
<!ATTLIST METADATA-CLASS
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT Class (ClassName , StandardName , VisibleName , Description , TableVersion , TableDate , UpdateVersion , UpdateDate , ClassTimeStamp? , DeletedFlagField?, DeletedFlagValue?, METADATA-TABLE? , METADATA-UPDATE? , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-TABLE (Field+)>
<!ATTLIST METADATA-TABLE
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	Class CDATA #REQUIRED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT Field ((SystemName , StandardName , LongName , DBName , ShortName , MaximumLength , DataType , Precision , Searchable , Interpretation , Alignment , UseSeparator , EditMaskID , LookupName , MaxSelect , Units , Index , Minimum , Maximum , Default , Required , SearchHelpID , Unique , ModTimeStampName?, ForeignKeyName?, ForeignField?, KeyQuery?, KeySelect?, MetadataEntryID?, EXTENSION* , PROPRIETARY*)|(SystemName , StandardName , LongName , DBName , ShortName , MaximumLength , DataType , Precision , Searchable , Interpretation , Alignment , UseSeparator , EditMaskID , LookupName , MaxSelect , Units , Index , Minimum , Maximum , Default , Required , SearchHelpID , Unique , ModTimeStampName?, ForeignKeyName?, ForeignField?, KeyQuery?, KeySelect?, EXTENSION* , PROPRIETARY*))>
<!ELEMENT METADATA-UPDATE (UpdateType+)>
<!ATTLIST METADATA-UPDATE
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	Class CDATA #REQUIRED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT UpdateType (MetadataEntryID?, UpdateName , Description , KeyField , UpdateTypeVersion , UpdateTypeDate , METADATA-UPDATE_TYPE? , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-UPDATE_TYPE (UpdateField+)>
<!ATTLIST METADATA-UPDATE_TYPE
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	Class CDATA #REQUIRED
	Update CDATA #REQUIRED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT UpdateField (MetadataEntryID?, SystemName , Sequence , Attributes , Default , ValidationExpressionID , UpdateHelpID , ValidationLookupName , ValidationExternalName , MaxUpdate? , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-OBJECT (Object+)>
<!ATTLIST METADATA-OBJECT
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT Object (ObjectType , StandardName , MimeType , Description , ObjectTimeStamp?, ObjectCount?, EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-SEARCH_HELP (SearchHelp+)>
<!ATTLIST METADATA-SEARCH_HELP
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT SearchHelp (SearchHelpID , Value , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-EDITMASK (EditMask+)>
<!ATTLIST METADATA-EDITMASK
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT EditMask (MetadataEntryID?, EditMaskID , Value , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-UPDATE_HELP (UpdateHelp+)>
<!ATTLIST METADATA-UPDATE_HELP
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT UpdateHelp (MetadataEntryID?, UpdateHelpID , Value , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-LOOKUP (LookupType+)>
<!ATTLIST METADATA-LOOKUP
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	Version CDATA #REQUIRED
   Date CDATA #REQUIRED>
<!ELEMENT LookupType (MetadataEntryID?, LookupName , VisibleName , LookupTypeVersion , LookupTypeDate , METADATA-LOOKUP_TYPE? , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-LOOKUP_TYPE (Lookup+)>
<!ATTLIST METADATA-LOOKUP_TYPE
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	Lookup CDATA #REQUIRED
	Version CDATA #REQUIRED
Date CDATA #REQUIRED>
<!ELEMENT Lookup (MetadataEntryID?, LongValue , ShortValue , Value , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-VALIDATION_LOOKUP (ValidationLookupType+)>
<!ATTLIST METADATA-VALIDATION_LOOKUP
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT ValidationLookupType (MetadataEntryID?, ValidationLookupName , Parent1Field , Parent2Field , ValidationLookupTypeVersion , ValidationLookupTypeDate , METADATA-VALIDATION_LOOKUP_TYPE? , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-VALIDATION_LOOKUP_TYPE (ValidationLookup+)>
<!ATTLIST METADATA-VALIDATION_LOOKUP_TYPE
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	ValidationLookup CDATA #REQUIRED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT ValidationLookup (MetadataEntryID?, ValidText , Parent1Value , Parent2Value , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-VALIDATION_EXPRESSION (ValidationExpression+)>
<!ATTLIST METADATA-VALIDATION_EXPRESSION
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT ValidationExpression (MetadataEntryID?, ValidationExpressionID , ValidationExpressionType , Value , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-VALIDATION_EXTERNAL (ValidationExternalType+)>
<!ATTLIST METADATA-VALIDATION_EXTERNAL
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT ValidationExternalType (MetadataEntryID?, ValidationExternalName , SearchResource , SearchClass , ValidationExternalTypeVersion , ValidationExternalTypeDate , METADATA-VALIDATION_EXTERNAL_TYPE? , EXTENSION* , PROPRIETARY*)>
<!ELEMENT METADATA-VALIDATION_EXTERNAL_TYPE (ValidationExternal+)>
<!ATTLIST METADATA-VALIDATION_EXTERNAL_TYPE
        System CDATA #IMPLIED
	Resource CDATA #REQUIRED
	ValidationExternal CDATA #REQUIRED
	Version CDATA #REQUIRED
	Date CDATA #REQUIRED>
<!ELEMENT ValidationExternal (MetadataEntryID?, SearchField+ , DisplayField+ , ResultFields+ , EXTENSION* , PROPRIETARY*)>
<!ELEMENT ResultFields (Source , Target , EXTENSION* , PROPRIETARY*)>