Standard DTD

              <!-- 

              A DTD for ATLAS Interchange Format, a means of interchanging
              annotations.

              Version History

              Date        Version  Authors
                                  
                                   Following joint discussions with
                                   Bird (LDC), Garofolo (NIST), Laprun (NIST),
                                   Henderson (MITRE) and Day (MITRE).
              2000-07-11   v1.0b   Christophe Laprun (NIST)
              2000-09-08   v1.0b2  Christophe Laprun (NIST)
              2000-09-22   v1.0b3  Steven Bird (LDC)
              2000-09-27   v1.0b4  David Day (MITRE)
              2000-09-28   v1.0b5  Steven Bird (LDC)
              2000-09-28   v1.0b6  Christophe Laprun (NIST)
              2000-09-28   v1.0b7  Christophe Laprun (NIST)
              2000-10-03   v1.0b8  Christophe Laprun (NIST)
              -->

              <!-- Overview:

                          Corpus := Metadata Analysis*
                                 [attrs: id, version, xmlns, xmlns:xlink]
                        Metadata := DCES* OtherMetadata*
                   OtherMetadata := PCDATA
                                 [attrs: name]

                        Analysis := Metadata? SignalInfo Annotation*
                                 [attrs: id, type]
                                 [aka: AnnotationLayer, AnnotationLevel]

                      SignalInfo := Metadata? Signal+ AnchorSet RegionSet
                                 [aka: AnnotationSubstrate]
                          Signal := EMPTY
                                 [attrs: id, mimeClass, mimeType, encoding,
                                  xlink:type, xlink:href, role]
                       AnchorSet := Anchor*
                          Anchor := Parameter+
                                 [attrs: id, type, role, signals]
                       AnchorRef := EMPTY
                                 [attrs: xlink:type, xlink:href, role]
                       RegionSet := Region*
                          Region := ( RegionRef | AnchorRef )*
                                 [attrs: id, type, role]
                       RegionRef := EMPTY
                                 [attrs: xlink:type, xlink:href, role]

                      Annotation := RegionRef Content
                                 [attrs: id, type]
                         Content := FeatureData | RegionRef
                                 [attrs: type]
                     FeatureData := ( Feature | Parameter | AnnotationRef | Reference )+
                         Feature := FeatureData
                                 [attrs: name, type]
                       Parameter := PCDATA
                                 [attrs: id, type, datatype, role, unit]
                   AnnotationRef := EMPTY
                                 [attrs: xlink:type, xlink:href, role]

                       Reference := EMPTY
                                 [attrs: xlink:type, xlink:href, role, type]
              -->

              <!ENTITY % MetadataDef SYSTEM "metadata.dtd"> %MetadataDef;

              <!ENTITY % DataTypes "(boolean | char | float | int | string | other)">

              <!ENTITY % FeatureData "(Feature  | Parameter | AnnotationRef | Reference)+">

              <!ELEMENT Corpus
                ( Metadata, Analysis* )>
              <!ATTLIST Corpus
                  id          ID     #REQUIRED
                  version     CDATA  #FIXED    "1.0"
                  xmlns       CDATA  #FIXED    "http://www.nist.gov/speech/atlas"
                  xmlns:xlink CDATA  #FIXED    "http://www.w3.org/1999/xlink"
              >

              <!ELEMENT Analysis
                ( Metadata?, SignalInfo, Annotation* )>
              <!ATTLIST Analysis
                  id          ID       #REQUIRED
                  type        NMTOKEN  #IMPLIED
              >

              <!ELEMENT SignalInfo
                ( Metadata?, Signal+, AnchorSet, RegionSet )>

              <!ELEMENT RegionSet ( Region* )>

              <!ELEMENT AnchorSet ( Anchor* )>

              <!ELEMENT Signal EMPTY>
              <!ATTLIST Signal
                  id          ID         #REQUIRED
                  mimeClass   CDATA      #REQUIRED
                  mimeType    CDATA      #REQUIRED
                  encoding    CDATA      #REQUIRED
                  xlink:type  CDATA      #FIXED        "simple"
                  xlink:href  CDATA      #IMPLIED
                  role        NMTOKEN    #IMPLIED
              >

              <!ELEMENT Annotation ( RegionRef, Content )>
              <!ATTLIST Annotation
                  id         ID         #REQUIRED
                  type       NMTOKEN    #REQUIRED
              >

              <!ELEMENT Content ( %FeatureData; | RegionRef )>
              <!ATTLIST Content
                  type       NMTOKEN    #IMPLIED
              >

              <!ELEMENT Feature %FeatureData;>
              <!ATTLIST Feature
                  name        NMTOKEN    #REQUIRED
                  type        NMTOKEN    #IMPLIED     
              >

              <!ELEMENT Region ( RegionRef | AnchorRef )*>
              <!ATTLIST Region
                  id          ID         #REQUIRED
                  type        NMTOKEN    #REQUIRED
                  role        NMTOKEN    #IMPLIED
              >

              <!ELEMENT Anchor (Parameter+)>
              <!ATTLIST Anchor
                  id          ID        #REQUIRED
                  type        NMTOKEN   #REQUIRED
                  role        NMTOKEN   #IMPLIED
                  signals     IDREFS    #REQUIRED
              >

              <!ELEMENT Parameter (#PCDATA)>
              <!ATTLIST Parameter
                  type        NMTOKEN     #IMPLIED
                  datatype    %DataTypes; #REQUIRED 
                  role        NMTOKEN     #IMPLIED    
                  unit        NMTOKEN     #IMPLIED
              >

              <!ELEMENT AnnotationRef EMPTY>
              <!ATTLIST AnnotationRef
                  xlink:type    CDATA    #FIXED     "simple"
                  xlink:href    CDATA    #REQUIRED
                  role          NMTOKEN  #IMPLIED
              >

              <!ELEMENT Reference EMPTY>
              <!ATTLIST Reference
                  xlink:type    CDATA    #FIXED     "simple"
                  xlink:href    CDATA    #REQUIRED
                  role          NMTOKEN  #IMPLIED
                  type          NMTOKEN  #REQUIRED
              >

              <!ELEMENT RegionRef EMPTY>
              <!ATTLIST RegionRef
                  xlink:type    CDATA      #FIXED      "simple"
                  xlink:href    CDATA      #REQUIRED
                  role          NMTOKEN    #IMPLIED
              >

              <!ELEMENT AnchorRef EMPTY>
              <!ATTLIST AnchorRef
                  xlink:type    CDATA      #FIXED    "simple"
                  xlink:href    CDATA      #REQUIRED
                  role          NMTOKEN    #REQUIRED    
              >



              <!-- The Metadata element will conform to future ISLE specification.
                   For now, we include the Dublin Core elements, plus room for
                   extensions.  Later we will distinguish between ATLAS
                   and private extensions, conforming with the Open Archives Initiative.
              -->

              <!ATTLIST Corpus
                  xmlns:dc CDATA  #FIXED    "http://purl.org/DC/documents/rec-dces-19990702.htm"
              >

              <!ENTITY % dces "dc:title | dc:creator | dc:subject | dc:description |
               dc:publisher | dc:contributor | dc:date | dc:type | dc:format |
               dc:identifier | dc:source | dc:language | dc:relation | dc:coverage |
               dc:rights" >

              <!ELEMENT Metadata ((%dces;)*, OtherMetadata*)>
              <!ELEMENT dc:title (#PCDATA)>
              <!ELEMENT dc:creator (#PCDATA)>
              <!ELEMENT dc:subject (#PCDATA)>
              <!ELEMENT dc:description (#PCDATA)>
              <!ELEMENT dc:publisher (#PCDATA)>
              <!ELEMENT dc:contributor (#PCDATA)>
              <!ELEMENT dc:date (#PCDATA)>
              <!ELEMENT dc:type (#PCDATA)>
              <!ELEMENT dc:format (#PCDATA)>
              <!ELEMENT dc:identifier (#PCDATA)>
              <!ELEMENT dc:source (#PCDATA)>
              <!ELEMENT dc:language (#PCDATA)>
              <!ELEMENT dc:relation (#PCDATA)>
              <!ELEMENT dc:coverage (#PCDATA)>
              <!ELEMENT dc:rights (#PCDATA)>

              <!ELEMENT OtherMetadata (#PCDATA)>
              <!ATTLIST OtherMetadata
                  name        NMTOKEN  #REQUIRED
              >