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ContentModelForLinks.htm
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ContentModelForLinks.htm
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<html>
<head>
<meta http-equiv=Content-Type content="text/html; charset=utf-8">
<meta name=Generator content="Microsoft Word 14 (filtered)">
<style id="dynCom" type="text/css">
<!-- -->
</style>
<style>
/* Font Definitions */
@font-face
{
font-family: Wingdings;
panose-1: 5 0 0 0 0 0 0 0 0 0;
}
@font-face
{
font-family: Wingdings;
panose-1: 5 0 0 0 0 0 0 0 0 0;
}
@font-face
{
font-family: Cambria;
panose-1: 2 4 5 3 5 4 6 3 2 4;
}
@font-face
{
font-family: Calibri;
panose-1: 2 15 5 2 2 2 4 3 2 4;
}
@font-face
{
font-family: Tahoma;
panose-1: 2 11 6 4 3 5 4 4 2 4;
}
/* Style Definitions */
p.MsoNormal,
li.MsoNormal,
div.MsoNormal {
margin-top: 0in;
margin-right: 0in;
margin-bottom: 10.0pt;
margin-left: 0in;
line-height: 115%;
font-size: 11.0pt;
font-family: "Calibri", "sans-serif";
}
h1 {
mso-style-link: "Heading 1 Char";
margin-top: 24.0pt;
margin-right: 0in;
margin-bottom: 0in;
margin-left: 0in;
margin-bottom: .0001pt;
line-height: 115%;
page-break-after: avoid;
font-size: 14.0pt;
font-family: "Cambria", "serif";
color: #B6A011;
}
h2 {
mso-style-link: "Heading 2 Char";
margin-top: 10.0pt;
margin-right: 0in;
margin-bottom: 0in;
margin-left: 0in;
margin-bottom: .0001pt;
line-height: 115%;
page-break-after: avoid;
font-size: 13.0pt;
font-family: "Cambria", "serif";
color: #4F81BD;
}
h3 {
mso-style-link: "Heading 3 Char";
margin-top: 10.0pt;
margin-right: 0in;
margin-bottom: 0in;
margin-left: 0in;
margin-bottom: .0001pt;
line-height: 115%;
page-break-after: avoid;
font-size: 11.0pt;
font-family: "Cambria", "serif";
color: #4A81BD;
}
h4 {
mso-style-link: "Heading 4 Char";
margin-top: 10.0pt;
margin-right: 0in;
margin-bottom: 0in;
margin-left: 0in;
margin-bottom: .0001pt;
line-height: 115%;
page-break-after: avoid;
font-size: 11.0pt;
font-family: "Cambria", "serif";
color: #4F81BD;
font-style: italic;
}
p.MsoToc1,
li.MsoToc1,
div.MsoToc1 {
margin-top: 6.0pt;
margin-right: 0in;
margin-bottom: 0in;
margin-left: 0in;
margin-bottom: .0001pt;
font-size: 10.0pt;
font-family: "Calibri", "sans-serif";
}
p.MsoToc2,
li.MsoToc2,
div.MsoToc2 {
margin-top: 2.0pt;
margin-right: 0in;
margin-bottom: 0in;
margin-left: .2in;
margin-bottom: .0001pt;
font-size: 10.0pt;
font-family: "Calibri", "sans-serif";
}
p.MsoToc3,
li.MsoToc3,
div.MsoToc3 {
margin-top: 0in;
margin-right: 0in;
margin-bottom: 0in;
margin-left: .4in;
margin-bottom: .0001pt;
font-size: 10.0pt;
font-family: "Calibri", "sans-serif";
}
p.MsoCommentText,
li.MsoCommentText,
div.MsoCommentText {
mso-style-link: "Comment Text Char";
margin-top: 0in;
margin-right: 0in;
margin-bottom: 10.0pt;
margin-left: 0in;
font-size: 10.0pt;
font-family: "Calibri", "sans-serif";
}
p.MsoHeader,
li.MsoHeader,
div.MsoHeader {
mso-style-link: "Header Char";
margin: 0in;
margin-bottom: .0001pt;
font-size: 11.0pt;
font-family: "Calibri", "sans-serif";
}
p.MsoFooter,
li.MsoFooter,
div.MsoFooter {
mso-style-link: "Footer Char";
margin: 0in;
margin-bottom: .0001pt;
font-size: 11.0pt;
font-family: "Calibri", "sans-serif";
}
p.MsoCaption,
li.MsoCaption,
div.MsoCaption {
margin-top: .25in;
margin-right: 0in;
margin-bottom: 0in;
margin-left: 0in;
margin-bottom: .0001pt;
page-break-after: avoid;
font-size: 9.0pt;
font-family: "Calibri", "sans-serif";
color: #4F81BD;
font-weight: bold;
}
span.MsoCommentReference {
font-family: "Times New Roman", "serif";
}
p.MsoTitle,
li.MsoTitle,
div.MsoTitle {
mso-style-link: "Title Char";
margin-top: 0in;
margin-right: 0in;
margin-bottom: 15.0pt;
margin-left: 0in;
border: none;
padding: 0in;
font-size: 26.0pt;
font-family: "Cambria", "serif";
color: #17365D;
letter-spacing: .25pt;
}
p.MsoTitleCxSpFirst,
li.MsoTitleCxSpFirst,
div.MsoTitleCxSpFirst {
mso-style-link: "Title Char";
margin: 0in;
margin-bottom: .0001pt;
border: none;
padding: 0in;
font-size: 26.0pt;
font-family: "Cambria", "serif";
color: #17365D;
letter-spacing: .25pt;
}
p.MsoTitleCxSpMiddle,
li.MsoTitleCxSpMiddle,
div.MsoTitleCxSpMiddle {
mso-style-link: "Title Char";
margin: 0in;
margin-bottom: .0001pt;
border: none;
padding: 0in;
font-size: 26.0pt;
font-family: "Cambria", "serif";
color: #17365D;
letter-spacing: .25pt;
}
p.MsoTitleCxSpLast,
li.MsoTitleCxSpLast,
div.MsoTitleCxSpLast {
mso-style-link: "Title Char";
margin-top: 0in;
margin-right: 0in;
margin-bottom: 15.0pt;
margin-left: 0in;
border: none;
padding: 0in;
font-size: 26.0pt;
font-family: "Cambria", "serif";
color: #17365D;
letter-spacing: .25pt;
}
a:link,
span.MsoHyperlink {
font-family: "Times New Roman", "serif";
color: blue;
text-decoration: underline;
}
a:visited,
span.MsoHyperlinkFollowed {
font-family: "Times New Roman", "serif";
color: purple;
text-decoration: underline;
}
em {
font-family: "Times New Roman", "serif";
}
p.MsoCommentSubject,
li.MsoCommentSubject,
div.MsoCommentSubject {
mso-style-link: "Comment Subject Char";
margin-top: 0in;
margin-right: 0in;
margin-bottom: 10.0pt;
margin-left: 0in;
font-size: 10.0pt;
font-family: "Calibri", "sans-serif";
font-weight: bold;
}
p.MsoAcetate,
li.MsoAcetate,
div.MsoAcetate {
mso-style-link: "Balloon Text Char";
margin: 0in;
margin-bottom: .0001pt;
font-size: 8.0pt;
font-family: "Tahoma", "sans-serif";
}
p.MsoNoSpacing,
li.MsoNoSpacing,
div.MsoNoSpacing {
mso-style-link: "No Spacing Char";
margin: 0in;
margin-bottom: .0001pt;
font-size: 11.0pt;
font-family: "Calibri", "sans-serif";
}
p.MsoRMPane,
li.MsoRMPane,
div.MsoRMPane {
margin: 0in;
margin-bottom: .0001pt;
font-size: 11.0pt;
font-family: "Calibri", "sans-serif";
}
p.MsoListParagraph,
li.MsoListParagraph,
div.MsoListParagraph {
margin-top: 0in;
margin-right: 0in;
margin-bottom: 10.0pt;
margin-left: .5in;
line-height: 115%;
font-size: 11.0pt;
font-family: "Calibri", "sans-serif";
}
p.MsoListParagraphCxSpFirst,
li.MsoListParagraphCxSpFirst,
div.MsoListParagraphCxSpFirst {
margin-top: 0in;
margin-right: 0in;
margin-bottom: 0in;
margin-left: .5in;
margin-bottom: .0001pt;
line-height: 115%;
font-size: 11.0pt;
font-family: "Calibri", "sans-serif";
}
p.MsoListParagraphCxSpMiddle,
li.MsoListParagraphCxSpMiddle,
div.MsoListParagraphCxSpMiddle {
margin-top: 0in;
margin-right: 0in;
margin-bottom: 0in;
margin-left: .5in;
margin-bottom: .0001pt;
line-height: 115%;
font-size: 11.0pt;
font-family: "Calibri", "sans-serif";
}
p.MsoListParagraphCxSpLast,
li.MsoListParagraphCxSpLast,
div.MsoListParagraphCxSpLast {
margin-top: 0in;
margin-right: 0in;
margin-bottom: 10.0pt;
margin-left: .5in;
line-height: 115%;
font-size: 11.0pt;
font-family: "Calibri", "sans-serif";
}
span.MsoIntenseEmphasis {
font-family: "Times New Roman", "serif";
color: #4F81BD;
font-weight: bold;
font-style: italic;
}
span.MsoIntenseReference {
font-family: "Times New Roman", "serif";
font-variant: small-caps;
color: #C0504D;
letter-spacing: .25pt;
font-weight: bold;
text-decoration: underline;
}
p.MsoTocHeading,
li.MsoTocHeading,
div.MsoTocHeading {
margin-top: 24.0pt;
margin-right: 0in;
margin-bottom: 0in;
margin-left: 0in;
margin-bottom: .0001pt;
line-height: 115%;
page-break-after: avoid;
font-size: 14.0pt;
font-family: "Cambria", "serif";
color: #365F91;
font-weight: bold;
}
span.Heading1Char {
mso-style-name: "Heading 1 Char";
mso-style-link: "Heading 1";
font-family: "Cambria", "serif";
color: #365F91;
font-weight: bold;
}
span.Heading2Char {
mso-style-name: "Heading 2 Char";
mso-style-link: "Heading 2";
font-family: "Cambria", "serif";
color: #4F81BD;
font-weight: bold;
}
span.Heading3Char {
mso-style-name: "Heading 3 Char";
mso-style-link: "Heading 3";
font-family: "Cambria", "serif";
color: #4F81BD;
font-weight: bold;
}
span.Heading4Char {
mso-style-name: "Heading 4 Char";
mso-style-link: "Heading 4";
font-family: "Cambria", "serif";
color: #4F81BD;
font-weight: bold;
font-style: italic;
}
span.HeaderChar {
mso-style-name: "Header Char";
mso-style-link: Header;
font-family: "Times New Roman", "serif";
}
span.FooterChar {
mso-style-name: "Footer Char";
mso-style-link: Footer;
font-family: "Times New Roman", "serif";
}
span.TitleChar {
mso-style-name: "Title Char";
mso-style-link: Title;
font-family: "Cambria", "serif";
color: #17365D;
letter-spacing: .25pt;
}
span.BalloonTextChar {
mso-style-name: "Balloon Text Char";
mso-style-link: "Balloon Text";
font-family: "Tahoma", "sans-serif";
}
p.TableSmallText,
li.TableSmallText,
div.TableSmallText {
mso-style-name: TableSmallText;
mso-style-link: "TableSmallText Char";
margin: 0in;
margin-bottom: .0001pt;
font-size: 9.0pt;
font-family: "Calibri", "sans-serif";
}
p.references,
li.references,
div.references {
mso-style-name: references;
mso-style-link: "references Char";
margin-top: 0in;
margin-right: 0in;
margin-bottom: 3.0pt;
margin-left: .4in;
text-indent: -.4in;
font-size: 10.0pt;
font-family: "Calibri", "sans-serif";
}
span.NoSpacingChar {
mso-style-name: "No Spacing Char";
mso-style-link: "No Spacing";
font-family: "Times New Roman", "serif";
}
span.TableSmallTextChar {
mso-style-name: "TableSmallText Char";
mso-style-link: TableSmallText;
font-family: "Times New Roman", "serif";
}
span.referencesChar {
mso-style-name: "references Char";
mso-style-link: references;
font-family: "Times New Roman", "serif";
}
span.st {
mso-style-name: st;
font-family: "Times New Roman", "serif";
}
span.CommentTextChar {
mso-style-name: "Comment Text Char";
mso-style-link: "Comment Text";
font-family: "Times New Roman", "serif";
}
span.CommentSubjectChar {
mso-style-name: "Comment Subject Char";
mso-style-link: "Comment Subject";
font-family: "Times New Roman", "serif";
font-weight: bold;
}
.MsoChpDefault {
font-family: "Calibri", "sans-serif";
}
.MsoPapDefault {
margin-bottom: 10.0pt;
line-height: 115%;
}
/* Page Definitions */
@page WordSection1 {
size: 8.5in 11.0in;
margin: 1.0in 1.0in 1.0in 1.0in;
}
div.WordSection1 {
page: WordSection1;
}
/* List Definitions */
ol {
margin-bottom: 0in;
}
ul {
margin-bottom: 0in;
}
</style>
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=WordSection1>
<div style='border:none;border-bottom:solid #4F81BD 1.0pt;padding:0in 0in 4.0pt 0in'>
<p class=MsoTitle>Content model for hypermedia affordances</p>
</div>
<p class=MsoNormal>Working concept development document for discussion; evolved from Machine Actionable links discussion. For latest version, see <a href="https://github.com/usgin/usginspecs/blob/master/ContentModelForLinks.docx?raw=true">here</a>.</p>
<p class=MsoNormal>S.M. Richard <a href="mailto:[email protected]">[email protected]</a>
August 27, 2014</p>
<p class=MsoTocHeading>Contents</p>
<p class=MsoToc1><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976042">Introduction<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>1</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976043">Use Scenarios<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>2</span>
</a>
</span>
</span>
</p>
<p class=MsoToc1><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976044">Link Properties Review<span style='color:windowtext;
display:none;text-decoration:none'>.. </span><span style='color:windowtext;display:none;text-decoration:none'>3</span>
</a>
</span>
</span>
</p>
<p class=MsoToc1><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976045">Results of compilation of specifications<span
style='color:windowtext;display:none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>5</span>
</a>
</span>
</span>
</p>
<p class=MsoToc1><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976046">Discussion<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>12</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976047">Media type<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>12</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976048">Protocol and URI Scheme<span style='color:windowtext;
display:none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>13</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976049">URI Templates<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>14</span>
</a>
</span>
</span>
</p>
<p class=MsoToc1><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976050">Proposed solution for machine actionable links<span
style='color:windowtext;display:none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>14</span>
</a>
</span>
</span>
</p>
<p class=MsoToc1><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976051">Appendix 1. Examples<span style='color:windowtext;
display:none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>16</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976052">OpenSearch link in ESIP discovery/data cast<span
style='color:windowtext;display:none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>16</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976053">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>16</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976054">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>16</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976055">link to opensearch description<span style='color:windowtext;
display:none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>16</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976056">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>16</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976057">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>16</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976058">OGC Web Feature Service link<span style='color:windowtext;
display:none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>17</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976059">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>17</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976060">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>17</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976061">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>17</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976062">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>17</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976063">OGC Web Feature Service link<span style='color:windowtext;
display:none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>17</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976064">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>17</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976065">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>17</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976066">OpenDAP endpoint<span style='color:windowtext;display:
none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>18</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976067">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>18</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976068">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>18</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976069">WS service<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>18</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976070">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>18</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976071">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>18</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976072">ESRI geoservice<span style='color:windowtext;display:
none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>18</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976073">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>18</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976074">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>18</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976075">TileMill map service<span style='color:windowtext;
display:none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>19</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976076">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>19</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976077">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>19</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976078">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>19</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976079">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>19</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976080">OWS context link<span style='color:windowtext;display:
none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>19</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976081">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>19</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976082">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>19</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976083">CSW catalog<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>19</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976084">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>19</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976085">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>19</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976086">macrostrat endpoint<span style='color:windowtext;
display:none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>20</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976087">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>20</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976088">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>20</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976089">IRIS seismic data web service<span style='color:windowtext;
display:none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>20</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976090">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>20</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976091">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>20</span>
</a>
</span>
</span>
</p>
<p class=MsoToc2><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976092">Link to home document<span style='color:windowtext;
display:none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>20</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976093">Link property<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>20</span>
</a>
</span>
</span>
</p>
<p class=MsoToc3><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976094">Value<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>20</span>
</a>
</span>
</span>
</p>
<p class=MsoToc1><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976095">References and related reading<span style='color:windowtext;
display:none;text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>20</span>
</a>
</span>
</span>
</p>
<p class=MsoToc1><span class=MsoHyperlink><span style='font-family:"Calibri","sans-serif"'><a
href="#_Toc393976096">Glossary<span style='color:windowtext;display:none;
text-decoration:none'>. </span><span style='color:windowtext;display:none;text-decoration:none'>22</span>
</a>
</span>
</span>
</p>
<p class=MsoNormal> </p>
<p class=MsoNormal> </p>
<h1><a name="_Toc393976042">Introduction</a></h1>
<p class=MsoNormal>Web architecture encourages client software that is designed as an agent in a dynamic information space (Charlton, 2012). This is enabled by one of the fundamentals of REST architecture (Fielding, 2000; Fielding, 2008), 'hypermedia as the engine of application state' (HATEOS). Understanding this rather arcane concept is central to understanding modern web applications and architecture. The idea is that a web application is a software agent that retrieves documents from the web, and follows instructions contained in those documents to move towards a goal. The application starts with some objective, and a link to retrieve a hypermedia document that contains the initial instructions. Application logic consists of inspecting the instructions in the document, determining which instructions to follow, and executing those instructions. The logic may involve requesting user input to make choices or to provide information (fill out forms) necessary to complete the process; such user input is well accounted for by the hypermedia controls offered by HTML. This investigation is focused on links in documents that are intended to be processed by machine agents.
</p>
<p class=MsoNormal>The original web architecture was designed to account for human-directed navigation of links to obtain resources that for the most part were intended for display and visual processing by human users. With the increasing adoption of service-based architecture, linked data, and semantic web technology, machine interpretation and processing of resources is becoming an integral part of an evolving distributed computation system. Simply clicking on a link to see what you get does not work in this environment. Links between resources for machine-automated processing require additional information about the nature of the target resource, its capabilities, data structure, and content.</p>
<p class=MsoNormal>This approach revolves around the concept of hypermedia, a document that contains both information and controls to enable a user (human or automated) to make choices and select actions that direct the execution of an application towards a goal. HTML is a widely used hypermedia type. As originally conceived, it provided a human user with a text document containing links that could be followed to view other text documents. In the language of hypermedia, the text provides information, and links are the controls that provide the mechanism to change browser application state, i.e. display a new web page. The user in this case is a human, and any necessary explanation of the controls (links) is in the text for a user to read. This document outlines a scheme for properties that can be used to specify the behavior of a link in a hypermedia document such that machine agents can interpret the link and use it with minimal intervention by a human user. The idea is that the details of application execution are dynamic; the client doesn't have a fixed copy of the instructions with locked-in dependencies on particular URIs or processing models. Thus the application can evolve as technology changes or new capabilities are introduced.</p>
<p class=MsoNormal>This proposal addresses the following situation: given a choice between a number of hypermedia controls (links, also called 'affordances'), a software application (machine) must determine which controls will activate a representation or interface that progresses the application towards its goal. The solution proposed here is to develop conventions for a hypermedia format to describe the controls (links) it presents in a general way that can be used by a wide variety of hypermedia applications. This information is supplied as properties associated with the links in a hypermedia document instance.</p>
<p class=MsoNormal>There are a variety of situations in which a hypermedia document might present a list of links (affordances, controls). The objective might be to make an information resource available to a user in their native work environment, to reconstruct an archived compound digital object, or to execute a workflow or data visualization. The problem this project addresses is development of an abstract model for the information that must be included with these controls to enable a machine agent to select the proper one to achieve the application goal in a wide variety of situations. Various implementations based on a shared conceptual model will facilitate integration of applications and reuse of components.</p>
<p class=MsoNormal>This issue impacts a variety of current activities considering use of various hypermedia formats, including <a href="https://tools.ietf.org/html/rfc5023">Atom</a>, GeoRSS, and various XML schema to describe associations between resources. Some examples are the Open Geospatial Consortium <a href="http://www.ogcnetwork.net/context">OWS context
Standards Working Group</a>, the Earth Science Information Partners (ESIP) <a href="http://wiki.esipfed.org/index.php/Discovery_Cluster">data and service
casting schemes</a>, the <a href="http://www.energistics.org/asset-data-management/metadata-work-group">Energistics
energy industry ISO19115-1 metadata profile</a>, the protocol for<a href="http://www.w3.org/TR/powder-dr/"> Web Description Resources (POWDER</a>), USGS Community for Data Integration Web Application Integration Framework group, the Constrained Restful Environments Link Format (<a href="http://tools.ietf.org/html/rfc6690">CoRE</a>), linked data profiles being developed for JSON encoding (JSON-LD, <a href="http://json-ld.org/">http://json-ld.org/</a>), JSON hypermedia profiles (<a href="http://tools.ietf.org/html/draft-kelly-json-hal-06">HAL</a>, <a href="https://github.com/kevinswiber/siren">SIREN</a>, <a href="http://www.markus-lanthaler.com/hydra/">Hydra</a>, <a href="http://tools.ietf.org/html/draft-nottingham-json-home">Home Document</a>), and the <a href="http://www.openarchives.org/ore/">Open Archives Initiative
Object Reuse and Exchange</a> specification.</p>
<h2><a name="_Toc393976043">Use Scenarios</a></h2>
<p class=MsoNormal>Here are a variety of scenarios framed in several contexts: a metadata record, a ‘service cast’ or ‘dataset cast’ document, an ‘OWS context’ (‘common operating picture’) document (Atom XML or JSON), or an XML ‘data’ document (like GeoSciML). These use cases are all related to the issue of what information needs to be encoded to make a URI machine-actionable in a simple, useful <a>way</a>
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name="_msoanchor_1">[SMR1]</a> </span></span>-->.</p>
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</span></span>A data citation provides a link to directly access a particular subset of some data set.</p>
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</span></span>A GeoSciML instance document contains URIs that specify terminological quantifiers for various property elements; a user interface must present these using labels intelligible to users of the data</p>
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</span></span>A WaterML instance document contains URIs that specify terminological quantifiers for various property elements; a data processing application is comparing these attribute values to data from another source and must assess concept similarity. An owl representation would be most useful.</p>
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