Related URL


Definition

The <Related_URL> field specifies links to internet sites that contain information related to the data, as well as related Internet sites such as project home pages, related data archives/servers, metadata extensions, online software packages, web mapping services, and calibration/validation data. The <Related_URL> field consists of:

  • <URL_Content_Type> Describes the type of URL being referenced. The <URL_Content_Type> is selected from a list of controlled URL content type keywords and consists of:
    • <Type> Describes the type resources being referenced by the URL. For example, <Type>GET DATA></Type>.
    • <Subtype> Describes the subtype of the resource being referenced by the URL.
  • <Protocol> describes the protocol of the URL, such as http:// or https://.
  • <URL>is the URL to the resource associated with the data set.
  • <Title>is the title of the URL resource.
  • <Description> provides information about the resource defined by the <URL>.
  • <Mime_Type> describes the type of file included in a URL.
    • Suggested list of <Mime_Type>:
    • pdf => "application/pdf"
    • doc => "application/msword"
    • dot => "application/msword"
    • docx => "application/vnd.openxmlformats officedocument.wordprocessingml.document"
    • dotx => "application/vnd.openxmlformats-officedocument.wordprocessingml.template"
    • docm => "application/vnd.ms-word.document.macroEnabled.12"
    • dotm=> "application/vnd.ms-word.template.macroEnabled.12"
    • ps => "application/postscript"
    • ppt => "application/vnd.ms-powerpoint"
    • pot => "application/vnd.ms-powerpoint"
    • pps => "application/vnd.ms-powerpoint"
    • ppa => "application/vnd.ms-powerpoint"
    • pptx => "application/vnd.openxmlformats-officedocument.presentationml.presentation"
    • potx => "application/vnd.openxmlformats-officedocument.presentationml.template"
    • ppsx => "application/vnd.openxmlformats-officedocument.presentationml.slideshow"
    • ppam => "application/vnd.ms-powerpoint.addin.macroEnabled.12”
    • pptm => "application/vnd.ms-powerpoint.presentation.macroEnabled.12”
    • potm => "application/vnd.ms-powerpoint.template.macroEnabled.12”
    • ppsm => "application/vnd.ms-powerpoint.slideshow.macroEnabled.12"
    • odt => "application/vnd.oasis.opendocument.text"
    • dvi => "application/x-dvi"
    • zip => "application/x-compressed"
    • gzip => "application/gzip"
    • gz => "application/x-gzip"
    • tar => "application/x-tar"
    • targz => "application/x-tgz"
    • tgz => "application/x-tgz"
    • bz2 => "application/x-bzip"
    • tbz => "application/x-bzip-compressed-tar"
    • tarbz2 => "application/x-bzip-compressed-tar"
    • xls => "application/vnd.ms-excel"
    • xlt => "application/vnd.ms-excel"
    • xla => "application/vnd.ms-excel"
    • xlsx => "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
    • xltx => "application/vnd.openxmlformats-officedocument.spreadsheetml.template"
    • xlsm => "application/vnd.ms-excel.sheet.macroEnabled.12"
    • xltm => "application/vnd.ms-excel.template.macroEnabled.12"
    • xlam => "application/vnd.ms-excel.addin.macroEnabled.12"
    • xlsb => "application/vnd.ms-excel.sheet.binary.macroEnabled.12"
    • xml => "text/xml"
    • dtd => "text/xml"
    • tif => "image/tiff"
    • jpg => "image/jpeg"
    • gif => "image/gif"
    • png => "image/png"
    • mpeg => "video/mpeg"
    • mpg => "video/mpeg"
    • mov => "video/quicktime"
    • qt => "video/quicktime"
    • avi => "video/x-msvideo"
    • asf => "video/x-ms-asf"
    • asx => "video/x-ms-asf"
    • wmv => "video/x-ms-wmv"
    • shtml => "text/html"
    • html => "text/html"
    • htm => "text/html"
    • js => "text/javascript"
    • css => "text/css"
    • csv => "text/csv"
    • asc => "text/plain"
    • c => "text/plain"
    • cpp => "text/plain"
    • f => "text/plain"
    • for => "text/plain"
    • fpp => "text/plain"
    • ftn => "text/plain"
    • f90 => "text/plain"
    • f95 => "text/plain"
    • f03 => "text/plain"
    • f08 => "text/plain"
    • pro => "text/plain"
    • pl => "text/plain"
    • log => "text/plain"
    • conf => "text/plain"
    • spec => "text/plain"
    • text => "text/plain"
    • txt => "text/plain"
    • readme => "text/plain"
 
Syntax

<Related_URL>
    <URL_Content_Type>
      <Type>Related URL Type keyword</Type>
      <Subtype>Related URL Subtype keyword</Subtype>
    </URL_Content_Type>
    <Protocol>Text </Protocol>
    <URL>URL up to 600 characters</URL>
    <Title>Text</Title>
    <Description>Text</Description>
    <Mime_Type>Text </Mime_Type>
  </Related_URL>

  • <Description> may contain multiple lines of text. Characters may be selected from the UTF-8 character set.
 
Usage
  • The <Related_URL> field is required and may be repeated.
  • The <URL_Content_Type> and <URL> fields are required.
  • The <URL_Content_Type> subfields <Type> and <Subtype> must be selected from the set of URL Content Type keywords. <Subtype> is optional.
  • The <URL> subfield may be repeated within the <Related_URL>.
  • The <Description> subfield is recommended and is not repeatable.
  • The <Protocol>,<Title>,and <Mime_Type> subfields are optional and not repeatable.
 
Examples

<Related_URL>
    <URL_Content_Type>
      <Type>VIEW PROJECT HOME PAGE </Type>
    </URL_Content_Type>
    <URL>http://www.esipfed.org/</URL>
    <Description>Homepage of the Earth Science Information Partners (ESIP)</Description>
</Related_URL>


<Related_URL>
   <URL_Content_Type>
      <Type> GET RELATED VISUALIZATION </Type>
    </URL_Content_Type>
    <Protocol>https</Protocol>     <URL> https://svs.gsfc.nasa.gov/vis/a000000/a004300/a004387/Screenshot_from_2009_2015_sbs_print.jpg</URL>
&nbs;  <Title>El Nino: Distributing the Marine Food Web</Description>
    <Description>Visualization of El Nino: Disrupting the Marine Food Web</Description>
    <Mime_Tyle>jpg</Mime_Type> </Related_URL>


<Related_URL>
    <URL_Content_Type>
      <Type>GET DATA </Type>
    </URL_Content_Type>
    <URL>ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/medina-elizalde2005/medina-elizalde2005.txt</URL>
    <URL>ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/medina-elizalde2005/     <Description>Access to data and documentation files.</Description>
</Related_URL>


 

This document should be cited as:
Directory Interchange Format (DIF) Writer's Guide, 2018.
Global Change Master Directory.
National Aeronautics and Space Administration.
[https://idn.ceos.org/r/u/difguide/].