You can copy and paste the DTD from this page, or you can download the file OrganSpec.dtd.

<!-- OrganSpec DTD, version 0.2, copyright (c) IPORE 2002, all rights reserved -->

<!ELEMENT Accessory (
        Remark
        )* >
<!ATTLIST Accessory
        control CDATA ""
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        label CDATA ""
        name CDATA #REQUIRED
        order CDATA ""
        removedBy IDREF #IMPLIED
        >

<!ELEMENT Blower (
        Remark
        )* >
<!ATTLIST Blower
        cfm CDATA ""
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        hp CDATA ""
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        manufacturer CDATA ""
        removedBy IDREF #IMPLIED
        serial CDATA ""
        rpm CDATA ""
        voltage CDATA ""
        >

<!ELEMENT Borrowed (
        Remark
        )* >
<!ATTLIST Borrowed
        compass CDATA ""
        from IDREF #REQUIRED
        >

<!ELEMENT Builder (        Remark
        )* >
<!ATTLIST Builder
        city CDATA ""
        country CDATA ""
        id ID #IMPLIED
        name CDATA #REQUIRED
        opus CDATA ""
        state CDATA ""
        >

<!ELEMENT Case (
        Remark
        )* >
<!ATTLIST Case
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        removedBy IDREF #IMPLIED
        >       

<!ELEMENT CatalogID (
        Remark
        )* >
<!ATTLIST CatalogID
        catalog CDATA #REQUIRED
        id CDATA #REQUIRED
        >

<!ELEMENT Chamber (
        Accessory |
        Division |
        Keyboard |
        Pressure |
        Rank |
        Remark |
        Stop |
        Trap )* >
<!ATTLIST Chamber
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        enclosed (yes|no) #REQUIRED
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        name CDATA ""
        removedBy IDREF #IMPLIED
        >

<!ELEMENT Composition (
        MixtureRank |
        Remark )* >
<!ATTLIST Composition 
        builder IDREF #IMPLIED
        date CDATA ""
        >

<!ELEMENT Console (
        Accessory |
        Coupler |
        Division |
        KeyAction |
        Keyboard |
        Remark |
        StopAction |
        SwellPedal
        )* >
<!ATTLIST Console
        couplers CDATA ""
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        removedBy IDREF #IMPLIED
        stops CDATA ""
        >

<!ELEMENT Coupler (
        Remark
        )* >
<!ATTLIST Coupler
        control CDATA ""
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        from IDREF #REQUIRED
		fromSpecial CDATA ""
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        label CDATA ""
        order CDATA ""
        pitch CDATA "8"
        removedBy IDREF #IMPLIED
        to IDREF #IMPLIED
		type (normal|off|other|unknown) #IMPLIED
        >

<!ELEMENT Division (
        Accessory |
        Chamber |
        Coupler |
        KeyAction |
        Pressure |
        Rank |
        Remark |
        Stop |
        StopAction |
        Trap )* >
<!ATTLIST Division
        compass CDATA ""
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        enclosed (yes|no) #IMPLIED
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        keyboard IDREF #IMPLIED
        name CDATA ""
        notes CDATA ""
        order CDATA ""
        removedBy IDREF #IMPLIED
        >

<!ELEMENT History (
        Remark
        )* >
<!ATTLIST History
        end CDATA ""
        id ID #IMPLIED
        start CDATA #REQUIRED
        >

<!ELEMENT KeyAction (
        Remark
        )* >
<!ATTLIST KeyAction
        dateInstalled CDATA ""
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        type CDATA #REQUIRED
        >

<!ELEMENT Keyboard (
        Accessory |
        Chamber |
        Coupler |
        Division |
        KeyAction |
        Pressure |
        Remark |
        Stop |
        StopAction |
        Trap )* >
<!ATTLIST Keyboard
        compass CDATA ""
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        divided CDATA ""
        enclosed (yes|no) #IMPLIED
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        name CDATA ""
        notes CDATA ""
        order CDATA ""
        removedBy IDREF #IMPLIED
        >

<!ELEMENT Location (
        Remark
        )* >
<!ATTLIST Location
        address CDATA ""
        city CDATA #REQUIRED
        country CDATA #REQUIRED
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        id ID #IMPLIED
        name CDATA #REQUIRED
        state CDATA ""
    type (church|concert|museum|other|practice|residence|theatre) #REQUIRED
        >

<!ELEMENT MixtureRank (
        Remark |
        Scale )* >
<!ATTLIST MixtureRank
        from CDATA #REQUIRED
        to CDATA #REQUIRED
        pitch CDATA #REQUIRED
        >

<!ELEMENT Organ (
        Accessory |     
        Blower |
        Builder | 
        Case |
        CatalogID |
        Chamber |
        Console |
        Coupler | 
        Division | 
        History |
        KeyAction  |
        Keyboard | 
        Location | 
        Pressure | 
        Rank |
        Recording | 
        Relay |
        Remark |
        Revision | 
        Source | 
        StopAction |
        SwellPedal |
        Trap | 
        Tuning 
        )+ >
<!ATTLIST Organ 
        version CDATA #REQUIRED
        > 

<!ELEMENT Pressure (
        Remark
        )* >
<!ATTLIST Pressure
        builder IDREF #IMPLIED
        date CDATA ""
        id ID #IMPLIED
        units (in|mm) #REQUIRED
        value CDATA #REQUIRED
        >

<!ELEMENT Rank (
        Pressure | 
        Remark |
        Scale )* >  
<!ATTLIST Rank
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        maker IDREF #IMPLIED
        material CDATA ""
        name CDATA #REQUIRED
        pipes CDATA ""
        pitch CDATA ""
        type (flue|reed|diaphone|percussion|other) #IMPLIED
        removedBy IDREF #IMPLIED
        >

<!ELEMENT Recording (
        Remark
        )* >
<!ATTLIST Recording
        artist CDATA ""
        date CDATA ""
        format CDATA ""
        id ID #IMPLIED
        label CDATA #REQUIRED
        title CDATA #REQUIRED
        >

<!ELEMENT Relay (
        Remark
        )* >
<!ATTLIST Relay
        dateInstalled CDATA ""
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        manufacturer CDATA ""
        type CDATA ""
        >

<!ELEMENT Remark (
        #PCDATA |
        A |
        EM )* >
<!ATTLIST Remark
        author CDATA ""
        date CDATA ""
        language (de|en|fr|it|sp) #REQUIRED
        >
<!ELEMENT A ( #PCDATA )* >
<!ATTLIST A
        href CDATA #REQUIRED
        >
<!ELEMENT EM ( #PCDATA )* >

<!ELEMENT Revision (#PCDATA)>
<!ATTLIST Revision
        by CDATA #REQUIRED
        date CDATA #REQUIRED
        >

<!ELEMENT Scale (
        Remark )* >

<!ELEMENT Source (
        Remark )* >
<!ATTLIST Source
		article CDATA ""
        artist CDATA ""
        author CDATA ""
        date CDATA ""
		isbn CDATA ""
		issue CDATA ""
        publisher CDATA ""
        title CDATA ""
        type (book|other|pamphlet|periodical|personal|recording|web) #REQUIRED
        url CDATA ""
        >

<!ELEMENT Stop (
        Borrowed |
        Composition |
        Pressure |
        Remark | 
        Scale )* >  
<!ATTLIST Stop
        borrowed IDREF #IMPLIED
        compass CDATA ""
        control CDATA ""
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        doubleDraw IDREF #IMPLIED
        extension IDREF #IMPLIED
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        label CDATA ""
        maker IDREF #IMPLIED
        material CDATA ""
        name CDATA #REQUIRED
        order CDATA ""
        pipes CDATA ""
        pitch CDATA ""
        rank IDREF #IMPLIED
        ranks CDATA ""
        removedBy IDREF #IMPLIED
        type (flue|reed|diaphone|percussion|other) #IMPLIED
        >

<!ELEMENT StopAction (
        Remark
        )* >
<!ATTLIST StopAction
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        removedBy IDREF #IMPLIED
        type CDATA #REQUIRED
        >

<!ELEMENT SwellPedal (
        Remark
        )* >
<!ATTLIST SwellPedal
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        chamber IDREF #REQUIRED
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        label CDATA ""
        order CDATA ""
        removedBy IDREF #IMPLIED
        >

<!ELEMENT Trap (
        Remark
        )* >  
<!ATTLIST Trap
        dateInstalled CDATA ""
        dateRemoved CDATA ""
        id ID #IMPLIED
        installedBy IDREF #IMPLIED
        label CDATA ""
        maker IDREF #IMPLIED
        name CDATA #REQUIRED
        removedBy IDREF #IMPLIED
        >

<!ELEMENT Tuning (
        Remark
        )* >
<!ATTLIST Tuning
        builder IDREF #IMPLIED
        date CDATA ""
        freqA CDATA ""
        id ID #IMPLIED
        temperament CDATA ""
        >

<!ENTITY gt     "&amp;gt;">
<!ENTITY lt     "&amp;lt;">
<!ENTITY amp    "&amp;amp;">
<!ENTITY Auml   "&amp;Auml;">
<!ENTITY aacute "&amp;aacute;">
<!ENTITY agrave "&amp;agrave;">
<!ENTITY auml   "&amp;auml;">
<!ENTITY ccedil "&amp;ccedil;">
<!ENTITY eacute "&amp;eacute;">
<!ENTITY egrave "&amp;egrave;">
<!ENTITY iacute "&amp;iacute;">
<!ENTITY ntilde "&amp;ntilde;">
<!ENTITY oacute "&amp;oacute;">
<!ENTITY ouml   "&amp;ouml;">
<!ENTITY szlig  "&amp;szlig;">
<!ENTITY ucirc  "&amp;ucirc;">
<!ENTITY eol    "&amp;eol;">