From: http://www.ietf.org/internet-drafts/draft-ietf-trade-ecml2-spec-05.txt
Electronic Commerce Modeling Language (ECML): Version 2 Specification
ID: draft-ietf-trade-ecml2-spec-05.txt

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2.2 ECML v2 XML DTD

   For internationalization of ECML, use the general XML character
   encoding provisions [XML], which mandate support of UTF-8 and UTF-16
   and permit support of other character sets, and the xml:lang
   attribute which may be used to specify language information.

   <!-- Electronic Commerce Modeling Language v2 -->

   <!ELEMENT Ecom ( #PCDATA | ShipTo | BillTo | ReceiptTo | Payment |
                    Loyalty | User | Merchant | Transaction |
                    TransactionComplete )* >
   <!ATTLIST Ecom
             id        ID         #IMPLIED
             ConsumerOrderID CDATA #IMPLIED
             Merchant  CDATA      #IMPLIED
             Mode      (Query|Assert) #IMPLIED
             Processor CDATA      #IMPLIED
             SchemaVersion "http://ecml.trade.wg.ietf.arpa/version/2.0"
                                  #IMPLIED
             WalletID  CDATA      #IMPLIED
             WalletLocation CDATA #IMPLIED >

   <!ELEMENT ShipTo ( #PCDATA | Postal | Telecom | Online )* >
   <!ATTLIST ShipTo
             id        ID         #IMPLIED
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT BillTo  ( #PCDATA | Postal | Telecom | Online )* >
   <!ATTLIST BillTo
             id        ID         #IMPLIED
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT ReceiptTo ( #PCDATA | Postal | Telecom | Online )* >
   <!ATTLIST ReceiptTo
             id        ID         #IMPLIED
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT Postal ( #PCDATA | Name | Company |
                                Street | City | StateProv )* >
   <!ATTLIST Postal
             id        ID         #IMPLIED
             PostalCode NMTOKEN   #IMPLIED
             Mode      (Query|Assert) #IMPLIED
             CountryCode NMTOKEN  #IMPLIED >

   <!ELEMENT Name EMPTY >
   <!ATTLIST Name
             id        ID         #IMPLIED
             Mode      (Query|Assert) #IMPLIED
             Prefix    NMTOKEN    #IMPLIED
             First     NMTOKEN    #IMPLIED
             Middle    NMTOKEN    #IMPLIED
             Last      NMTOKEN    #IMPLIED
             Suffix    NMTOKEN    #IMPLIED >

   <!ELEMENT Street EMPTY >
   <!ATTLIST Street
             id        ID         #IMPLIED
             Mode      (Query|Assert) #IMPLIED
             Line1     CDATA      #REQUIRED
             Line2     CDATA      #IMPLIED
             Line3     CDATA      #IMPLIED >

   <!ELEMENT Company (#PCDATA) >
   <!ATTLIST Company
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT City (#PCDATA) >
   <!ATTLIST City
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT StateProv (#PCDATA) >
   <!ATTLIST StateProv
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT Telecom ( #PCDATA | Phone )* >
   <!ATTLIST Telecom
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT Phone EMPTY >
   <!ATTLIST Phone
             id         ID        #IMPLIED
             Mode       (Query|Assert) #IMPLIED
             Number     CDATA     #REQUIRED >

   <!ELEMENT Online ( #PCDATA | Email )* >
   <!ATTLIST Online
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT Email EMPTY >
   <!ATTLIST Email
             id         ID        #IMPLIED
             Mode       (Query|Assert) #IMPLIED
             Address    CDATA     #REQUIRED >

   <!ELEMENT Payment Card >
   <!ATTLIST Payment
             Mode       (Query|Assert) #IMPLIED >
   <!ELEMENT Card ExpDate >
   <!ATTLIST Card
             id          ID        #IMPLIED
             Mode       (Query|Assert) #IMPLIED
             Name        CDATA     #IMPLIED
             Type        NMTOKEN   #IMPLIED
             Number      NMTOKEN   #REQUIRED
             Protocols   NMTOKENS  #IMPLIED
             Verification NMTOKEN  #IMPLIED >

   <!ELEMENT ExpDate EMPTY >
   <!ATTLIST ExpDate
             id          ID        #IMPLIED
             Mode        (Query|Assert) #IMPLIED
             Day         NMTOKEN   #IMPLIED
             Month       NMTOKEN   #REQUIRED
             Year        NMTOKEN   #REQUIRED >

   <!ELEMENT Loyalty EMPTY>
   <!ATTLIST Loyalty
             id          ID        #IMPLIED
             Mode        (Query|Assert) #IMPLIED
             Name        CDATA     #IMPLIED
             Number      NMTOKEN   #REQUIRED
             Verification NMTOKEN  #IMPLIED >

   <!ELEMENT User ( #PCDATA | UserID | Password )* >
   <!ATTLIST User
             id          ID        #IMPLIED
             Mode        (Query|Assert) #IMPLIED
             CertificateURL CDATA  #IMPLIED
             DataCountry NMTOKEN   #IMPLIED
             DataLanguage CDATA    #IMPLIED >

   <!ELEMENT UserID (#PCDATA) >
   <!ATTLIST UserID
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT Password (#PCDATA) >
   <!ATTLIST Password
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT Merchant Terminal >
   <!ATTLIST Merchant
             Mode        (Query|Assert) #IMPLIED
             id          ID        #IMPLIED >

   <!ELEMENT Terminal EMPTY >
   <!ATTLIST Terminal
             Id          ID     #IMPLIED
             Mode        (Query|Assert) #IMPLIED
             Data        CDATA  #IMPLIED >

   <!ELEMENT Transaction ( #PCDATA | Id | Code | Date | Data |
                           Inquiry | Signature )* >
   <!ATTLIST Transaction
             Amount      CDATA     #IMPLIED
             Currency    NMTOKEN   #IMPLIED
             Mode        (Query|Assert) #IMPLIED
             Type        NMTOKEN   #IMPLIED >

   <!ELEMENT Id EMPTY >
   <!ATTLIST Id
             Id          ID        #IMPLIED
             Mode        (Query|Assert) #IMPLIED
             CID         NMTOKEN   #IMPLIED
             Reference   NMTOKEN   #IMPLIED
             Acquire     NMTOKEN   #IMPLIED
             Forward     NMTOKEN   #IMPLIED >

   <!ELEMENT Code EMPTY >
   <!ATTLIST Code
             Mode        (Query|Assert) #IMPLIED
             Processing  CDTATA    #IMPLIED
             Approval    NMTOKEN   #IMPLIED
             Retrieval   NMTOKEN   #IMPLIED
             Action      NMTOKEN   #IMPLIED
             Reason      NMTOKEN   #IMPLIED
             POS         NMTOKEN   #IMPLIED >

   <!ELEMENT Date (Effective?, Settle?, Capture?) >
   <!ATTLIST Date
             Mode        (Query|Assert) #IMPLIED
             id          ID        #IMPLIED >

   <!ELEMENT Effective EMPTY >
   <!ATTLIST Effective
             id          ID        #IMPLIED
             Mode        (Query|Assert) #IMPLIED
             Day         NMTOKEN   #REQUIRED
             Month       NMTOKEN   #REQUIRED
             Year        NMTOKEN   #REQUIRED >

   <!ELEMENT Settle EMPTY >
   <!ATTLIST Settle
             id          ID        #IMPLIED
             Mode        (Query|Assert) #IMPLIED
             Day         NMTOKEN   #REQUIRED
             Month       NMTOKEN   #REQUIRED
             Year        NMTOKEN   #REQUIRED >
   <!ELEMENT Capture EMPTY >
   <!ATTLIST Capture
             id          ID        #IMPLIED
             Mode        (Query|Assert) #IMPLIED
             Day         NMTOKEN   #REQUIRED
             Month       NMTOKEN   #REQUIRED
             Year        NMTOKEN   #REQUIRED >

   <!ELEMENT DATA ( #PCDATA | Trace | PrivateUse | Response |
                    AAV | Track1 | Track2 )* >
   <!ATTLIST DATA
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT Trace #PCDATA >
   <!ATTLIST Trade
             id        ID         #IMPLIED
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT PrivateUse #PCDATA >
   <!ATTLIST PrivateUse
             id        ID         #IMPLIED
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT Response #PCDATA >
   <!ATTLIST Response
             id        ID         #IMPLIED
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT AAV #PCDATA >
   <!ATTLIST AAV
             id        ID         #IMPLIED
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT Track1 #PCDATA >
   <!ATTLIST Track1
             id        ID         #IMPLIED
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT Track2 #PCDATA >
   <!ATTLIST TRack2
             id        ID         #IMPLIED
             Mode      (Query|Assert) #IMPLIED >

   <!ELEMENT TransactionComplete EMPTY >