From: http://alexandria.sdc.ucsb.edu/docs/metadata/ADL-collection-metadata.dtd
Date: 1999-03-11

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#                                                                             #
#                         ALEXANDRIA DIGITAL LIBRARY                          #
#                  University of California at Santa Barbara                  #
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$Header: /usr/home/alex1/gjanee/utils/collection-metadata/data/RCS/ADL-collection-metadata.dtd,v 1.3 1998/11/10 17:21:45 gjanee Exp $

DESCRIPTION

    This is an XML document type definition for the ADL collection
    metadata.

AUTHOR

    Greg Janee
    gjanee@alexandria.ucsb.edu

HISTORY

    $Log: ADL-collection-metadata.dtd,v $
    Revision 1.3  1998/11/10 17:21:45  gjanee
    Added element 'alert'.

    Revision 1.2  1998/09/05 22:46:56  gjanee
    Added element 'temporal-coverage'.

    Revision 1.1  1998/08/22 22:53:43  gjanee
    Initial revision


-->

<!-- <!DOCTYPE ADL-collection-metadata [ -->

<!ENTITY % text "(#PCDATA)">
    <!-- a block of text, ranging in size from a single word to a
         single paragraph, in which every character is significant,
         and in which newlines are equivalent to spaces -->

<!ENTITY % hypertext "(#PCDATA | link)*">
    <!-- '%text;' with embedded hypertext links -->

<!ELEMENT link %text;>
    <!ATTLIST link
        url CDATA #REQUIRED>
    <!-- a hypertext link -->

<!ENTITY % date "(year, (month, day?)?)">
    <!-- a calendar date -->
    <!ELEMENT year (#PCDATA)>
        <!-- the year as a 4-digit integer, e.g., "1970" -->
    <!ELEMENT month (#PCDATA)>
        <!-- the full name of the month, e.g., "January" -->
    <!ELEMENT day (#PCDATA)>
        <!-- the day as a 1- or 2-digit integer, e.g., "1" -->

<!ENTITY % count "(#PCDATA)">
    <!-- a nonnegative integer, e.g., "32342" -->

<!ELEMENT internal-name (#PCDATA)>

<!ELEMENT external-name %hypertext;>

<!ELEMENT name %hypertext;>

<!ELEMENT computation-date %date;>

<!ELEMENT ADL-collection-metadata (internal-name, lowercase-name,
                                   uppercase-name, full-title, short-title,
                                   responsible-party?, scope-and-purpose?,
                                   subject-coverage?, content-type?,
                                   relationships?, creation-date?,
                                   last-update-date?, update-frequency?,
                                   metadata-schema?, sample-metadata-record?,
                                   terms-and-conditions?, contact?,
                                   ((item-type-hierarchy,
                                     item-type-thesaurus?) |
                                    item-type-description)?,
                                   ((item-format-hierarchy,
                                     item-format-thesaurus?) |
                                    item-format-description)?,
                                   ADL-search-buckets?, alert?, item-counts?,
                                   spatial-coverage?, temporal-coverage?)>

<!-- ELEMENT internal-name (#PCDATA) -->
    <!-- the collection's internal name, e.g., "adl_catalog" -->

<!ELEMENT lowercase-name %text;>
    <!-- the collection's lowercase name, e.g., "the ADL Catalog" -->

<!ELEMENT uppercase-name %text;>
    <!-- the collection's uppercase name, e.g., "THE ADL CATALOG" -->

<!ELEMENT full-title %hypertext;>
    <!-- the collection's full title, e.g., "Alexandria Digital
         Library Catalog" -->

<!ELEMENT short-title %hypertext;>
    <!-- the collection's short title, e.g., "ADL Catalog" -->

<!ELEMENT responsible-party %hypertext;>
    <!-- the party responsible for the collection, e.g., "Map and
         Imagery Laboratory, Davidson Library, University of
         California at Santa Barbara" -->

<!ELEMENT scope-and-purpose %hypertext;>
    <!-- the collection's scope and purpose, e.g., "The ADL Catalog
         provides metadata for geospatial data..." -->

<!ELEMENT subject-coverage %hypertext;>
    <!-- the coverage of the collection relative to the collection's
         subject area, e.g., "California earthquakes and other seismic
         events" -->

<!ELEMENT content-type %hypertext;>
    <!-- the nature of the collection's contents, e.g., "gazetteer
         data" or "bibliographic entries" -->

<!ELEMENT relationships %hypertext;>
    <!-- the collection's relationships to other collections -->

<!ELEMENT creation-date %date;>
    <!-- the date the collection was created -->

<!ELEMENT last-update-date %date;>
    <!-- the date the collection was last updated -->

<!ELEMENT update-frequency EMPTY>
    <!ATTLIST update-frequency
        value (yearly | monthly | daily | static | irregular) #REQUIRED>
    <!-- the frequency with which the collection is updated -->

<!ELEMENT metadata-schema %hypertext;>
    <!-- the collection's metadata schema, e.g., "FGDC" or "USMARC" -->

<!ELEMENT sample-metadata-record %hypertext;>
    <!-- a sample metadata record from the collection -->

<!ELEMENT terms-and-conditions %hypertext;>
    <!-- the terms and conditions under which the collection may be used -->

<!ELEMENT contact (name?, title?, (organization, larger-organization?)?,
                   postal-address?, e-mail-address?, phone-number?)>
    <!-- the human or institutional (preferably human) point of
         contact for the collection -->
    <!-- ELEMENT name %hypertext; -->
        <!-- the contact's name, e.g., "James Moriarty" -->
    <!ELEMENT title %hypertext;>
        <!-- the contact's title, e.g., "Professor" -->
    <!ELEMENT organization %hypertext;>
        <!-- the contact's organization, e.g., "Evil, Inc." -->
    <!ELEMENT larger-organization %hypertext;>
        <!-- the larger organization of which the above organization
             is part -->
    <!ELEMENT postal-address (((intra-organization-address?, street-address?) |
                               PO-box)?, city, state, zip-code)>
        <!-- the contact's postal address -->
        <!ELEMENT intra-organization-address %hypertext;>
            <!-- the physical address within the organization, e.g.,
                 "1205 Girvetz Hall" -->
        <!ELEMENT street-address %hypertext;>
            <!-- the street address, e.g., "123 Main St." -->
        <!ELEMENT PO-box (#PCDATA)>
            <!-- the post office box number, e.g., "9275" -->
        <!ELEMENT city (#PCDATA)>
            <!-- the city, e.g., "Santa Barbara" -->
        <!ELEMENT state (#PCDATA)>
            <!-- the state, e.g., "California" -->
        <!ELEMENT zip-code (#PCDATA)>
            <!-- the 5- or 9-digit zip code, e.g., "93106" -->
    <!ELEMENT e-mail-address (#PCDATA)>
        <!-- the contact's e-mail address, e.g., "james@nemesis.org" -->
    <!ELEMENT phone-number %hypertext;>
        <!-- the contact's phone number, e.g., "800-555-1212" -->

<!ELEMENT item-type-hierarchy (item-type*)>
    <!ATTLIST item-type-hierarchy
        id ID #IMPLIED>
    <!-- the hierarchy used to categorize the items in the collection
         by type, i.e., by semantic content; 'id' uniquely identifies
         the hierarchy among all categorization hierarchies in the
         metadata -->
    <!ELEMENT item-type (internal-name, external-name, item-type*)>
        <!ATTLIST item-type
            id ID #REQUIRED>
        <!-- a type of item in the collection and its subtypes; 'id'
             uniquely identifies the type among all item types -->
        <!-- ELEMENT internal-name (#PCDATA) -->
            <!-- the type's internal name, e.g., "^DATABASES^" -->
        <!-- ELEMENT external-name %hypertext; -->
            <!-- the type's external name, e.g., "Databases" -->

<!ELEMENT item-type-thesaurus %hypertext;>
    <!-- a reference to the thesaurus or authority list for the item
         type hierarchy -->

<!ELEMENT item-type-description %hypertext;>
    <!-- an informal description of the types of items in the
         collection -->

<!ELEMENT item-format-hierarchy (item-format*)>
    <!ATTLIST item-format-hierarchy
        id ID #IMPLIED>
    <!-- the hierarchy used to categorize the items in the collection
         by format; 'id' uniquely identifies the hierarchy among all
         categorization hierarchies in the metadata -->
    <!ELEMENT item-format (internal-name, external-name, item-format*)>
        <!ATTLIST item-format
            id ID #REQUIRED>
        <!-- a format of item in the collection and its subformats; 'id'
             uniquely identifies the format among all item formats -->
        <!-- ELEMENT internal-name (#PCDATA) -->
            <!-- the format's internal name, e.g., "^ERDAS^^LAN^" -->
        <!-- ELEMENT external-name %hypertext; -->
            <!-- the format's external name, e.g., "ERDAS/Lan" -->

<!ELEMENT item-format-thesaurus %hypertext;>
    <!-- a reference to the thesaurus or authority list for the item
         format hierarchy -->

<!ELEMENT item-format-description %hypertext;>
    <!-- an informal description of the formats of items in the
         collection -->

<!ELEMENT ADL-search-buckets (bucket*)>
    <!-- ADL search buckets supported by the collection -->
    <!ELEMENT bucket (name, description?, metadata-mapping?, notes?, domain?)>
        <!ATTLIST bucket
            id ID #REQUIRED
            input-type (date | map | text | tree) #REQUIRED>
        <!-- a search bucket; 'id' identifies the bucket among all
             search buckets; 'input-type' indicates the type of input
             interface required by the bucket -->
        <!-- ELEMENT name %hypertext; -->
            <!-- the bucket's name, e.g., "Geographic location" -->
        <!ELEMENT description %hypertext;>
            <!-- a description of the bucket's abstract semantics,
                 e.g., "Supports searching by any geographic locations
                 or regions associated with collection items." -->
        <!ELEMENT metadata-mapping %hypertext;>
            <!-- a description of how the collection's metadata is
                 mapped to the bucket, e.g., "The ADL Catalog
                 populates this bucket with..." -->
        <!ELEMENT notes %hypertext;>
            <!-- additional notes on how the collection implements the
                 bucket -->
        <!ELEMENT domain EMPTY>
            <!ATTLIST domain
                type (hierarchical) #REQUIRED
                hierarchy IDREF #IMPLIED>
            <!-- indicates the domain of the bucket; if the domain
                 type is 'hierarchical', then 'hierarchy' should
                 reference a hierarchical metadata element (e.g.,
                 'item-type-hierarchy') -->

<!ELEMENT alert %hypertext;>
    <!-- an important, timely message concerning the collection, e.g.,
         "This collection is temporarily offline..." -->

<!ELEMENT item-counts (computation-date, total-item-count?,
                       item-counts-by-type?, item-counts-by-format?)>
    <!-- collection item counts -->
    <!-- ELEMENT computation-date %date; -->
        <!-- the date the counts were computed -->
    <!ELEMENT total-item-count %count;>
        <!-- the total number of items in the collection -->
    <!ELEMENT item-counts-by-type (item-count-for-type*)>
        <!-- the numbers of items in the collection, by item type -->
        <!ELEMENT item-count-for-type %count;>
            <!ATTLIST item-count-for-type
                type IDREF #REQUIRED>
            <!-- the number of items of type 'type' -->
    <!ELEMENT item-counts-by-format (item-count-for-format*)>
        <!-- the numbers of items in the collection, by item format -->
        <!ELEMENT item-count-for-format %count;>
            <!ATTLIST item-count-for-format
                format IDREF #REQUIRED>
            <!-- the number of items of format 'format' -->

<!ELEMENT spatial-coverage (computation-date, overall-spatial-coverage?,
                            spatial-coverage-by-type?,
                            spatial-coverage-by-format?)>
    <!-- the spatial (geographic) coverage of the collection -->
    <!-- ELEMENT computation-date %date; -->
        <!-- the date the coverages were computed -->
    <!ELEMENT overall-spatial-coverage (spatial-histogram*)>
        <!-- the overall spatial coverage of the collection -->
    <!ELEMENT spatial-coverage-by-type (spatial-coverage-for-type*)>
        <!-- the spatial coverage of the collection, by item type -->
        <!ELEMENT spatial-coverage-for-type (spatial-histogram*)>
            <!ATTLIST spatial-coverage-for-type
                type IDREF #REQUIRED>
            <!-- the spatial coverage of items of type 'type' -->
    <!ELEMENT spatial-coverage-by-format (spatial-coverage-for-format*)>
        <!-- the spatial coverage of the collection, by item format -->
        <!ELEMENT spatial-coverage-for-format (spatial-histogram*)>
            <!ATTLIST spatial-coverage-for-format
                format IDREF #REQUIRED>
            <!-- the spatial coverage of items of format 'format' -->
    <!ELEMENT spatial-histogram (#PCDATA)>
        <!ATTLIST spatial-histogram
            num-rows CDATA #REQUIRED
            num-columns CDATA #REQUIRED
            separator CDATA #REQUIRED>
        <!-- A two-dimensional histogram, dimensioned 'num-rows' by
             'num-columns', of nonnegative integers.  The domain of
             the histogram reflects geodetic coverage, with rows
             corresponding to latitude and columns corresponding to
             longitude.  Histogram values are listed as a stream of
             integers separated by character 'separator'.  The values
             are listed in row-major order, with rows listed in order
             of descending latitude starting with 90 degrees and
             columns listed in order of ascending longitude starting
             with -180 degrees. -->

<!ELEMENT temporal-coverage (computation-date, overall-temporal-coverage?,
                             temporal-coverage-by-type?,
                             temporal-coverage-by-format?)>
    <!-- the temporal coverage of the collection -->
    <!-- ELEMENT computation-date %date; -->
        <!-- the date the coverages were computed -->
    <!ELEMENT overall-temporal-coverage (temporal-histogram*)>
        <!-- the overall temporal coverage of the collection -->
    <!ELEMENT temporal-coverage-by-type (temporal-coverage-for-type*)>
        <!-- the temporal coverage of the collection, by item type -->
        <!ELEMENT temporal-coverage-for-type (temporal-histogram*)>
            <!ATTLIST temporal-coverage-for-type
                type IDREF #REQUIRED>
            <!-- the temporal coverage of items of type 'type' -->
    <!ELEMENT temporal-coverage-by-format (temporal-coverage-for-format*)>
        <!-- the temporal coverage of the collection, by item format -->
        <!ELEMENT temporal-coverage-for-format (temporal-histogram*)>
            <!ATTLIST temporal-coverage-for-format
                format IDREF #REQUIRED>
            <!-- the temporal coverage of items of format 'format' -->
    <!ELEMENT temporal-histogram (#PCDATA)>
        <!ATTLIST temporal-histogram
            granularity (decade | year | month | day) #REQUIRED
            first-year CDATA #REQUIRED
            num-years CDATA #REQUIRED
            prefix-value CDATA #REQUIRED
            suffix-value CDATA #REQUIRED
            separator CDATA #REQUIRED>
        <!-- A one-dimensional histogram of nonnegative integers whose
             domain is time.  'granularity' is the amount of time
             represented by a single histogram bin.  'first-year' is
             the first year of the histogram domain and 'num-years' is
             the size of the domain in (whole) years.  If
             'granularity' is 'decade', both 'first-year' and
             'num-years' are multiples of 10.  If 'granularity' is
             'month' or 'day', the number of bins is 12 or 365 times
             'num-years', respectively.  'prefix-value' is the value
             of all bins previous to the first histogram bin and
             'suffix-value' is the value of all bins subsequent to the
             last bin.  The histogram values are listed as a stream of
             integers separated by the single character
             'separator'. -->

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