Metacat

<!--

  * Ecological Metadata Language (EML) - Data set structural descriptors

  *

  *      Authors: Matt Jones, Zheng Wang, and Noah Goldstein

  * Organization: National Center for Ecological Analysis and Synthesis

  *  For Details: http://www.nceas.ucsb.edu/

  *      Created: 1997 August 19

  *     Modified: 1999 June 23

  *      Version: 1.4

  *    File Info: '$Id$'

  *

  * Ecological Metadata Language is a general purpose metadata content

  * specification for documenting ecological data.  The specification

  * consists of a series of modular document type definitions (DTD) that

  * provide metadata content descriptors. It describes the owner and

  * contents of the dataset  (eml-dataset.dtd), the research context in

  * which it was created (eml-context.dtd), the structural

  * characteristics of data files (eml-file.dtd), the

  * characteristics of variables in a file (eml-variable.dtd), current

  * status of data and metadata files (eml-status.dtd), access control

  * rules regarding the data  and metadata (eml-access.dtd), software

  * information (eml-software) and a variety of miscellaneous

  * supplemental descriptors (eml-supplement.dtd).

  *

  * Files generated under the structural constraints of eml are

  * plain-text files and therefore are editable in ordinary

  * text-processors.  However, these DTDs are intended for use within

  * general purpose metadata editors, and within a more specific

  * metadata editor being developed at NCEAS for the ecological

  * community.  This metadata editor will provide facilities for

  * version control and efficient metadata entry.

  * The purpose of this specification was to formalize the

  * Michener et al. work in a structured language to examine its

  * application to ecological data in a controlled manner.

  *

  * This specification was based on the work of the Ecological Society

  * of America's Committee on the Future of Long Term Data, and more

  * specifically on a related paper, Michener et al., 1997. See:

  * Michener, William K., et al., 1997. Ecological Appications,

  * "Nongeospatial metadata for the ecological sciences"

  * Vol 7(1). pp. 330-342.

  *

  * Where appropriate, we have used elements of the ISO/TC 211 draft

  * standard - the ISO Geographic information/Geomatics standard,

  * which includes xml code, as well as ISO 8601 schema. Some elements

  * in the ISO/TC 211 were expanded to allow for greater

  * resolution.

  *

  * For an explanation of the classes of metadata and elements defined

  * below, see Michener et al. 1997. In particular, the numbered comment

  * labels found below refer to Table 1 (pp. 336-337) of Michener

  * et al. 1997. In addition, each of the principal elements in the

  * specification is accompanied by a FIXED attribute called "description"

  * that provides a brief description of the content of the element. These

  * descriptions are derived from Michener et al. 1997.

  *

-->

<!--    *      *      *      *

        CLASS IV - DATA STRUCTURE DESCRIPTORS

        *      *      *      *

        -->

<!-- Class 4 -->

<!ELEMENT eml-file (meta_file_id, file)>

<!ATTLIST eml-file description CDATA #FIXED "Data structural descriptors">

<!ELEMENT meta_file_id (#PCDATA)>

<!ATTLIST meta_file_id description CDATA #FIXED "Unique identifier of this metadata record">

<!-- Class 4.A -->

<!ELEMENT file (file_name, file_size?, format, orientation?, header_lines?,

                case_sensitive?, geographic_coverage*, temporal_coverage*,

                authentication*, data_problem*)>

<!ATTLIST file description CDATA #FIXED "Data set file">

<!-- Class 4.A.1 -->

<!ELEMENT file_name (#PCDATA) >

<!ATTLIST file_name description CDATA #FIXED "File name">

<!-- Class 4.A.2 -->

<!ELEMENT file_size (amount, unit) >

<!ATTLIST file_size description CDATA #FIXED "Size of file">

<!ELEMENT amount (#PCDATA) >

<!ATTLIST amount description CDATA #FIXED "Amount">

<!ELEMENT unit (#PCDATA) >

<!ATTLIST unit description CDATA #FIXED "Unit">

<!-- Class 4.A.3 -->

<!ELEMENT format (compressed|encoded|base_file_type)>

<!ATTLIST format description CDATA #FIXED "File type and compression schemes employed">

<!ELEMENT compressed (#PCDATA)>

<!ATTLIST compressed description CDATA #FIXED "Method of compression">

<!ELEMENT encoded (#PCDATA)>

<!ATTLIST encoded description CDATA #FIXED "Method of encoding">

<!ELEMENT base_file_type (ASCII|binary)>

<!ATTLIST base_file_type description CDATA #FIXED "Base file type">

<!ELEMENT ASCII (record_delimiter)>

<!ATTLIST ASCII description CDATA #FIXED "ASCII">

<!ELEMENT record_delimiter (#PCDATA)>

<!ATTLIST record_delimiter description CDATA #FIXED "Record delimiter">

<!ELEMENT binary EMPTY>

<!ATTLIST binary description CDATA #FIXED "Binary">

<!-- NEW SECTION -->

<!ELEMENT orientation EMPTY >

<!ATTLIST orientation columnorrow (columnmajor|rowmajor) "columnmajor"

		      description CDATA #FIXED "Is file column major or row major?">

<!-- Class 4.A.4 -->

<!ELEMENT header_lines (#PCDATA) >

<!ATTLIST header_lines description CDATA #FIXED "Number of header lines or information that prepares data">

<!-- Class 4.A.5 -->

<!ELEMENT case_sensitive EMPTY >

<!ATTLIST case_sensitive yesorno (y|n) "n"

                   description CDATA #FIXED "Case sensitivity of field">

<!-- Class 4.A.6 -->

<!-- the field "specialfield" was removed as there were questions to its usefull ness -->

<!ELEMENT geographic_coverage (paragraph*, coordinates*)>

<!ATTLIST geographic_coverage description CDATA #FIXED "Geographic coverage">

<!ELEMENT coordinates (lattitude, longitude) >

<!ATTLIST coordinates description CDATA #FIXED "Cartesian Coordinates">

<!ELEMENT lattitude (#PCDATA)>

<!ATTLIST lattitude direction (north|south) #REQUIRED

                    description CDATA #FIXED "Lattitude coordinates">

<!ELEMENT longitude (#PCDATA)>

<!ATTLIST longitude direction (east|west) #REQUIRED

                    description CDATA #FIXED "Longitude coordinates">

<!ELEMENT temporal_coverage (start_date,stop_date?)>

<!ATTLIST temporal_coverage description CDATA #FIXED "Temporal coverage">

<!ELEMENT start_date (datetime)>

<!ATTLIST start_date description CDATA #FIXED "Date data collection commenced">

<!ELEMENT datetime (year?, month?, day?, hour?, minute?, second?, second_fraction?, time_zone_designator?)>

<!ATTLIST datetime description CDATA #FIXED "Date and time as designated in ISO 8601">

<!ELEMENT year (#PCDATA)>

<!ATTLIST year description CDATA #FIXED "Year in YYYY format">

<!ELEMENT month (#PCDATA)>

<!ATTLIST month description CDATA #FIXED "Month in MM format">

<!ELEMENT day (#PCDATA)>

<!ATTLIST day description CDATA #FIXED "Day of month in DD format">

<!ELEMENT hour (#PCDATA)>

<!ATTLIST hour description CDATA #FIXED "Hour in hh">

<!ELEMENT minute (#PCDATA)>

<!ATTLIST minute description CDATA #FIXED "Minute in mm">

<!ELEMENT second (#PCDATA)>

<!ATTLIST second description CDATA #FIXED "Seconds in ss">

<!ELEMENT second_fraction (#PCDATA)>

<!ATTLIST second_fraction description CDATA #FIXED "One or more digits representing a decimal fraction of a second">

<!ELEMENT time_zone_designator (#PCDATA)>

<!ATTLIST time_zone_designator description CDATA #FIXED "Time zone designator">

<!ELEMENT stop_date  (datetime)>

<!ATTLIST stop_date description CDATA #FIXED "Date data collection terminated">

<!-- Class 4.A.7 -->

<!ELEMENT authentication (#PCDATA) >

<!ATTLIST authentication description CDATA #FIXED "Authentication procedures or techniques">

<!-- Class 4.B -->

<!-- Class 4.B (variable) was moved to its own module (eml-variable.dtd) -->

<!-- Class 4.C -->

<!ELEMENT data_problem (paragraph+)>

<!ATTLIST data_problem problemtype (missing|anomaly|error) #REQUIRED

                      description CDATA #FIXED "Data anomalies; description of missing data">

<!ELEMENT paragraph (#PCDATA)>

<!ATTLIST paragraph description CDATA #FIXED "Paragraph of text">

<!-- End of file -->