Section 1 : Identification Information Element: Identification Information Section: 1 Description: basic information about the data set. Element: Citation Section: 1.1 Description: information to be used to reference the data set (see Section 8 for schema definitions). Element: Description Section: 1.2 Description: a characterization of the data set, including its intended use and limitations. Element: Abstract Section: 1.2.1 Description: a brief narrative summary of the data set. Type: text Domain: free text Element: Purpose Section: 1.2.2 Description: a summary of the intentions with which the data set was developed. Type: text Domain: free text Element: Supplemental Information Section: 1.2.3 Description: other descriptive information about the data set. Type: text Domain: free text Element: Time Period of Content Section: 1.3 Description: time period(s) for which the data set corresponds to the currentness reference. See Section 9 for schema definitions. Element: Currentness Reference Section: 1.3.1 Description: the basis on which the time period of content information is determined. Type: text Domain: "ground condition" "publication date" free text Enumerated values also match "free text" ]]> Element: Status Section: 1.4 Description: the state of and maintenance information for the data set. Element: Progress Section: 1.4.1 Description: the state of the data set. Type: text Domain: "Complete" "In work" "Planned" Element: Maintenance and Update Frequency Section: 1.4.2 Description: the frequency with which changes and additions are made to the data set after the initial data set is completed. Type: text Domain: "Continually" "Daily" "Weekly" "Monthly" "Annually" "Unknown" "As needed" "Irregular" "None planned" free text Enumerated values also match "free text" ]]> Element: Spatial Domain Section: 1.5 Description: the geographic areal domain of the data set. Element: Bounding Coordinates Section: 1.5.1 Description: the limits of coverage of a data set expressed by latitude and longitude values in the order western-most, eastern-most, northern-most, and southern-most. For data sets that include a complete band of latitude around the earth, the West Bounding Coordinate shall be assigned the value -180.0, and the East Bounding Coordinate shall be assigned the value 180.0 Element: West Bounding Coordinate Section: 1.5.1.1 Description: western-most coordinate of the limit of coverage expressed in longitude. Type: real Domain: -180.0 <= West Bounding Coordinate < 180.0 Element: East Bounding Coordinate Section: 1.5.1.2 Description: eastern-most coordinate of the limit of coverage expressed in longitude. Type: real Domain: -180.0 <= East Bounding Coordinate <= 180.0 Element: North Bounding Coordinate Section: 1.5.1.3 Description: northern-most coordinate of the limit of coverage expressed in latitude. Type: real Domain: -90.0 <= North Bounding Coordinate <= 90.0; North Bounding Coordinate >= South Bounding Coordinate Element: South Bounding Coordinate Section: 1.5.1.4 Description: southern-most coordinate of the limit of coverage expressed in latitude. South_Bounding_Coordinate (southbc) must be less than or equal to North_Bounding_Coordinate (northbc). Type: real Domain: -90.0 <= South Bounding Coordinate <= 90.0; South Bounding Coordinate <= North Bounding Coordinate Element: Data Set G-Polygon Section: 1.5.2 Description: coordinates defining the outline of an area covered by a data set. Element: Data Set G-Polygon Outer G-Ring Section: 1.5.2.1 Description: the closed nonintersecting boundary of an interior area. Element: G-Ring Point Section: 1.5.2.1.1 Description: a single geographic location. Element: G-Ring Latitude Section: 1.5.2.1.1.1 Description: the latitude of a point of the g-ring. G-Ring_Latitude (gringlat) must lie between the North_Bounding_Coordinate (northbc) and South_Bounding_Coordinate (southbc). Type: real Domain: -90.0 <= G-Ring Latitude <= 90.0 Element: G-Ring Longitude Section: 1.5.2.1.1.2 Description: the longitude of a point of the g-ring. G-Ring_Longitude (gringlon) must lie between the West_Bounding_Coordinate (westbc) and East_Bounding_Coordinate (eastbc). G-Ring_Longitude (gringlon) must lie between the West_Bounding_Coordinate (westbc) and East_Bounding_Coordinate (eastbc). Type: real Domain: -180.0 <= G-Ring Longitude < 180.0 Element: G-Ring Section: 1.5.2.1.2 Description: a set of ordered pairs of floating-point numbers, separated by commas, in which the first number in each pair is the longitude of a point and the second is the latitude of the point. Longitude and latitude are specified in decimal degrees with north latitudes positive and south negative, east longitude positive and west negative G-Ring (gring) does not contain an even number of values. G-Ring (gring) contains invalid characters. Type: text Domain: -90 <= Latitude_elements <= 90, -180 <= Longitude_Elements = 180 XML Schema does not provide a mechanism for comma-delimited lists, so the only way to restrict this element's domain is to define a regular expression pattern for the possible value domain. This particular pattern would be rather complex, therefore, only a simple Schematron rule is specified to count the number of value pairs. (This is done indirectly through the number of commas, which will be an odd number. The first pair has one comma between the two values and subsequent pairs will have a comma between the two values and a second comma to separate it from the preceding value pair. Therefore, if there are 'n' pairs of values, the number of commas should be '2n-1', an odd number.) A manual check (or a check with alternate software) is required to verify that the values in each pair are within the specified domains for latitudes and longitudes. Element: Data Set G-Polygon Exclusion G-Ring Section: 1.5.2.2 Description: the closed nonintersecting boundary of a void area (or "hole" in an interior area). Element: Keywords Section: 1.6 Description: words or phrases summarizing an aspect of the data set. Element: Theme Section: 1.6.1 Description: subjects covered by the data set (for a list of some commonly-used thesauri, see Part IV: Subject/index term sources in Network Development and MARC Standards Office, 1988, USMARC code list for relators, sources, and description conventions: Washington, Library of Congress). Element: Theme Keyword Thesaurus Section: 1.6.1.1 Description: reference to a formally registered thesaurus or a similar authoritative source of theme keywords. Type: text Domain: "None" free text Enumerated value also matches "free text" ]]> Element: Theme Keyword Section: 1.6.1.2 Description: common-use word or phrase used to describe the subject of the data set. Type: text Domain: free text Element: Place Section: 1.6.2 Description: geographic locations characterized by the data set. Element: Place Keyword Thesaurus Section: 1.6.2.1 Description: reference to a formally registered thesaurus or a similar authoritative source of place keywords. Type: text Domain: "None" "Geographic Names Information System" free text Enumerated values also match "free text" ]]> Element: Place Keyword Section: 1.6.2.2 Description: the geographic name of a location covered by a data set. Type: text Domain: free text Element: Stratum Section: 1.6.3 Description: layered, vertical locations characterized by the data set. Element: Stratum Keyword Thesaurus Section: 1.6.3.1 Description: reference to a formally registered thesaurus or a similar authoritative source of stratum keywords. Type: text Domain: "None" free text Enumerated value also matches "free text" ]]> Element: Stratum Keyword Section: 1.6.3.2 Description: the name of a vertical location used to describe the locations covered by a data set. Type: text Domain: free text Element: Temporal Section: 1.6.4 Description: time period(s) characterized by the data set. Element: Temporal Keyword Thesaurus Section: 1.6.4.1 Description: reference to a formally registered thesaurus or a similar authoritative source of temporal keywords. Type: text Domain: "None" free text Enumerated value also matches "free text" ]]> Element: Temporal Keyword Section: 1.6.4.2 Description: the name of a time period covered by a data set. Type: text Domain: free text Element: Access Constraints Section: 1.7 Description: restrictions and legal prerequisites for accessing the data set. These include any access constraints applied to assure the protection of privacy or intellectual property, and any special restrictions or limitations on obtaining the data set. Type: text Domain: "None" free text Enumerated value also matches "free text" ]]> Element: Use Constraints Section: 1.8 Description: restrictions and legal prerequisites for using the data set after access is granted. These include any use constraints applied to assure the protection of privacy or intellectual property, and any special restrictions or limitations on using the data set. Type: text Domain: "None" free text Enumerated value also matches "free text" ]]> Element: Point of Contact Section: 1.9 Description: contact information for an individual or organization that is knowledgeable about the data set (see Section 10 for schema definitions). Element: Browse Graphic Section: 1.10 Description: a graphic that provides an illustration of the data set. The graphic should include a legend for interpreting the graphic. Element: Browse Graphic File Name Section: 1.10.1 Description: name of a related graphic file that provides an illustration of the data set. Type: text Domain: free text Element: Browse Graphic File Description Section: 1.10.2 Description: a text description of the illustration. Type: text Domain: free text Element: Browse Graphic File Type Section: 1.10.3 Description: graphic file type of a related graphic file. Type: text Domain: domain values in the table below; free text Enumerated values also match "free text" ]]> Element: Data Set Credit Section: 1.11 Description: recognition of those who contributed to the data set. Type: text Domain: free text Element: Security Information Section: 1.12 Description: handling restrictions imposed on the data set because of national security, privacy, or other concerns. Element: Security Classification System Section: 1.12.1 Description: name of the classification system. Type: text Domain: free text Element: Security Classification Section: 1.12.2 Description: name of the handling restrictions on the data set. Type: text Domain: "Top secret" "Secret" "Confidential" "Restricted" "Unclassified" "Sensitive" free text Enumerated values also match "free text" ]]> Element: Security Handling Description Section: 1.12.3 Description: additional information about the restrictions on handling the data set. Type: text Domain: free text Element: Native Data Set Environment Section: 1.13 Description: a description of the data set in the producer's processing environment, including items such as the name of the software (including version), the computer operating system, file name (including host-, path-, and filenames), and the data set size. Type: text Domain: free text Element: Cross Reference Section: 1.14 Description: information about other, related data sets that are likely to be of interest (see Section 8 for schema definitions).