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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!-- saved from url=(0083)http://www.openannotation.org/spec/beta/examples/gatsby/index.html#DM_Serialization -->
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Maphub Open Annotation API Documentation</title>
<link rel="stylesheet" href="./css/maphub-api.css" type="text/css">
</head>
<body>
<div id="header">
<h2 class="title">Maphub Open Annotation API Documentation</h2>
<h3 class="subTitle">20 July 2012</h3>
</div>
<hr>
<div class="abstract">
<h2><a id="abstract" name="abstract"></a>Abstract</h2>
<p>This document describes how <a href="http://maphub.github.com/" title="maphub">Maphub</a> provides a Linked Data API by implementing the <a href="http://www.openannotation.org/" title="Welcome">W3C Open Annotation</a> specification. The provided examples demonstrate how the Open Annotation model could be used for representing annotations on digitized historic maps or high-resolution image material. They also show the use of <a href="http://www.openannotation.org/spec/extension/#SemanticTag" title="Open Annotation Draft Extension Specification">Semantic Tags</a>. The Maphub API currently provides access to two types of annotations:</p>
<ul>
<li><strong><a href="http://en.wikipedia.org/wiki/Georeference" title="Georeference - Wikipedia, the free encyclopedia">Georeference</a> Annotation</strong>: users create an annotation with the intention to express a correspondence between a point/region on the map and either a point/region in a defined geographic coordinate system or an authoritative Gazetteer. The goal of this type of annotation is to establish control points for raster image maps.</li>
<li><strong>Commentarial Annotation</strong>: users associate textual information, tags, or links to thesaurus terms or Semantic Web resources, etc. with a point or region on the map. The goal of this type of annotation is to provide additional information about the map or map segment.</li>
</ul>
<p>The definitions and examples in this document refer to <strong>Maphub version 0.3</strong>.</p>
</div>
<hr>
<h2><a id="contents" name="contents"></a>Table of Contents</h2>
<p class="toc">
1. <a href="#introduction">Introduction</a><br>
1.1. <a href="#background">Background</a><br>
1.2. <a href="#example">Example</a><br>
1.3. <a href="#namespaces">Namespaces</a><br>
2. <a href="#georef_example">Georeference Annotations</a><br>
3. <a href="#comment_example">Commentarial Annotations</a><br>
4. <a href="#annotation_index">Annotation Index</a><br>
5. <a href="#references">References and Further Information</a><br>
</p>
<h3><a id="appendices" name="appendices"></a>Appendices</h3>
<p class="toc">
A. <a href="#changelog">Change Log</a><br>
</p>
</div>
<hr>
<div class="body">
<h2><a id="introduction" name="introduction"></a>1. Introduction</h2>
<p>
Historic maps record historic geographic information and give insight into socio-economic and environmental phenomena such as land use, river channel changes or floods. They allow for the reconstruction of past urban environments and draw a picture of the cultural, political and religious context in which they were created. Their geographic accuracy tells us much about the state of technology at the time of their creation.
</p>
<p>
Scholars who study these maps often want to take notes on certain maps or map regions, view certain areas in the context of today’s maps, and associate map regions with historical events, places, or even people. By allowing them to annotate maps we allow them to express and share their knowledge with others. However, the historic maps that are currently published on the Web, mostly by libraries, don’t allow scholars or end-users to annotate them in a way that is interoperable across systems.
</p>
<h3><a id="background" name="background"></a>1.1 Background</h3>
<p><a href="http://maphub.github.com/" title="maphub">Maphub</a> is a Web portal for hosting digitized, high-resolution, historic maps. It allows users to annotate and contribute their knowledge about historic maps. It is currently being developed as part of the <a href="http://www.openannotation.org/" title="Welcome">Open Annotation Collaboration</a>. All user-contributed annotations are openly shared on the Web and represented in the <a href="http://www.openannotation.org/spec/core/" title="Open Annotation Draft Data Model">W3C Open Annotation data model</a>. Thereby they become Web resources that can be accessed by various clients simply by dereferencing HTTP URIs.</p>
<p>The current demo is bootstrapped with approximately 6000 public domain high-resolution map scans from the <a href="http://memory.loc.gov/ammem/gmdhtml/" title="Map Collections Home Page">Library of Congress Historic Map division</a>. A first <a href="http://vimeo.com/21390925" title="">concept screencast</a> and the portal's <a href="https://github.com/maphub/maphub-portal">source code</a> are available. The portal is built using <a href="http://rubyonrails.org/" title="Ruby on Rails">Ruby on Rails</a> and reuses components (and algorithms) that were previously developed for the <a href="https://github.com/yuma-annotation">YUMA annotation framework</a>. User-contributed annotations are linked with resources in other publicly available datasources, such as <a href="http://dbpedia.org/" title="DBPedia">DBpedia</a> and <a href="http://www.geonames.org/" title="GeoNames">GeoNames</a>.</p>
<h3><a id="example" name="example"></a>1.2 Example</h3>
<p>In the following examples we refer to a high-resolution scan of the <a href="http://en.wikipedia.org/wiki/Waldseem%C3%BCller_map" title="Waldseemüller map - Wikipedia, the free encyclopedia">Waldseemüller map</a>. We keep a copy of the JPEG2000 digitized map file from the <a href="http://memory.loc.gov/ammem/gmdhtml/" title="Map Collections Home Page">LoC Maps division</a> at <a href="http://samos.mminf.univie.ac.at/maps/raw/g3200.ct000725C.jp2" title="Digitized Waldseemüller map">http://samos.mminf.univie.ac.at/maps/raw/g3200.ct000725C.jp2</a>. The raw map image has a width of 18000 and a height of 10029 pixels.</p>
<center>
<table width="85%">
<tbody>
<tr>
<th class="exhead">Figure 1. Example Map.</th>
</tr>
<tr>
<td>
<center>
<img src="./img/maphub_map.jpg" class="example" alt="Example Map Annotations"/>
</center>
</td>
</tr>
</tbody>
</table>
</center>
<p>Map images are usually converted into tile sets for online viewing and zooming. MapHub uses the <a href="http://code.google.com/p/magicktiler/" title="magicktiler - A Java tool and embeddable library for converting images into formats suitable for publishing as zoomable Web images. - Google Project Hosting">magicktiler</a> tool to create Zoomify tilesets from the original JP2 images. The tilesets now reside parallel to the original image files, e.g.: <a href="http://samos.mminf.univie.ac.at/maps/ts_zoomify/g3200.ct000725C.jp2">http://samos.mminf.univie.ac.at/maps/ts_zoomify/g3200.ct000725C.jp2</a>. However, since tilesets represent a special view of the original map image, we can assume that the <strong>target</strong> of an annotation is always the original full-resolution <strong>map image file</strong>.</p>
<h3><a id="namespaces" name="namespaces"></a>1.3 Namespaces</h3>
<p>This document uses the following namespaces and prefixes to indicate those namespaces:</p>
<table class="namespace-table" summary="namespaces used in this document">
<tbody>
<tr>
<th>Prefix</th>
<th>Namespace URI</th>
<th>Description</th>
</tr>
<tr>
<td><code>oa</code></td>
<td><code>http://www.w3.org/ns/openannotation/core/</code></td>
<td>The core Open Annotation model</td>
</tr>
<tr>
<td><code>oax</code></td>
<td><code>http://www.w3.org/ns/openannotation/extension/</code></td>
<td>Interoperable extensions to the core model</td>
</tr>
<tr>
<td><code>cnt</code></td>
<td><code>http://www.w3.org/2008/content#</code></td>
<td>Representing Content in RDF</td>
</tr>
<tr>
<td><code>dc</code></td>
<td><code>http://purl.org/dc/elements/1.1/</code></td>
<td>Dublin Core Elements</td>
</tr>
<tr>
<td><code>dcterms</code></td>
<td><code>http://purl.org/dc/terms/</code></td>
<td>Dublin Core Terms</td>
</tr>
<tr>
<td><code>foaf</code></td>
<td><code>http://xmlns.com/foaf/0.1/</code></td>
<td>Friend of a Friend vocabulary terms</td>
</tr>
<tr>
<td><code>rdf</code></td>
<td><code>http://www.w3.org/1999/02/22-rdf-syntax-ns#</code></td>
<td>RDF vocabulary terms</td>
</tr>
<tr>
<td><code>rdfs</code></td>
<td><code>http://www.w3.org/2001/01/rdf-schema#</code></td>
<td>RDF Schema vocabulary</td>
</tr>
<tr>
<td><code>ore</code></td>
<td><code>http://www.openarchives.org/ore/terms/</code></td>
<td>OAI Object Reuse and Exchange</td>
</tr>
</tbody>
</table>
<br>
<!-- GEOREFERENCE ANNOTATIONS -->
<h2><a id="georef_example"></a>2. Georeference Annotations</h2>
<p>A Georeference Annotation, as shown in Figure 2, associates a place URI (a <strong>Semantic Tag</strong>) with a place on the map (the annotation <strong>Target</strong>).</p>
<center>
<table width="85%">
<tbody>
<tr>
<th class="exhead">Figure 2. Example Georeference Annotation.</th>
</tr>
<tr>
<td>
<center>
<img src="./img/maphub_control_point.jpg" class="example" alt="Example Control Point"/>
</center>
</td>
</tr>
</tbody>
</table>
</center>
<p>Place URIs are provided by the <a href="http://www.geonames.org/" title="GeoNames">Geonames</a> online gazetteer:</p>
<ul>
<li><a href="http://sws.geonames.org/2643743/">http://sws.geonames.org/2643743/</a>: London, UK</li>
<li><a href="http://sws.geonames.org/2517117/">http://sws.geonames.org/2517117/</a>: Granada, ES</li>
<li><a href="http://sws.geonames.org/2761369/">http://sws.geonames.org/2761369/</a>: Vienna, AT</li>
</ul>
<p>Georeference Annotations in Maphub are dereferenceable Web resources. When a client issues an HTTP GET request against the Georeference Annotation HTTP URI, Maphub determines the response format based on the value of the HTTP Accept header submitted by the client.</p>
<p>Figure 3 shows an example Georeference Annotation represented in the Open Annotation model. It can be retrieved by executing the following curl request:</br>
<code>curl -H "Accept: text/turtle" http://maphub.herokuapp.com/control_points/4</code>
</p>
<center>
<table width="85%">
<tbody><tr>
<th class="exhead">Figure 3. Open Annotation Georeference Annotation (Control Point)</th>
</tr>
<tr>
<td>
<div class="exsubhead">Model Instance</div>
<center> <img src="./img/maphub_oa_control_point.png" class="example" alt="Control Point Example"> </center></td>
</tr>
<tr>
<td>
<div class="exsubhead">Georeference Annotation - Turtle serialization</div>
<pre class="code">
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix oa: <http://www.w3.org/ns/openannotation/core/> .
@prefix foaf: <http://xmlns.com/foaf/spec/> .
@prefix oax: <http://www.w3.org/ns/openannotation/extensions/> .
@prefix dcterms: <http://purl.org/dc/dcmitype/> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix maphub: <http://maphub.info/ns/vocab#GeoReference> .
<http://maphub.herokuapp.com/control_points/4>
a maphub:GeoReference, oa:Annotation, oax:Tagging ;
oa:annotated "2012-08-17T17:13:41Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
oa:annotator <http://maphub.herokuapp.com/control_points/881c00ca-e892-11e1-a637-1231381d2be6> ;
oa:generated "2012-08-17T17:13:41Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
oa:generator <http://maphub.herokuapp.com> ;
oa:hasTarget <http://maphub.herokuapp.com/control_points/8824e514-e892-11e1-a637-1231381d2be6> ;
oax:hasSemanticTag <http://sws.geonames.org/2643743/> .
<http://maphub.herokuapp.com/control_points/881c00ca-e892-11e1-a637-1231381d2be6>
foaf:mbox "[email protected]" ;
foaf:name "behas" .
<http://maphub.herokuapp.com/control_points/8824e514-e892-11e1-a637-1231381d2be6>
a oa:SpecificResource ;
oa:hasSelector <http://maphub.herokuapp.com/control_points/88254b62-e892-11e1-a637-1231381d2be6> ;
oa:hasSource <http://samos.mminf.univie.ac.at/maps/raw/g3200.ct000725C.jp2> .
<http://maphub.herokuapp.com/control_points/88254b62-e892-11e1-a637-1231381d2be6>
a oa:FragmentSelector ;
rdf:value "xywh=6551,6231,1,1" .
<http://samos.mminf.univie.ac.at/maps/raw/g3200.ct000725C.jp2>
dc:format "image/jp2" ;
a dcterms:StillImage .
</pre>
</td>
</tr>
</tbody></table>
</center>
<!-- COMMENTARIAL ANNOTATIONS -->
<h2><a id="comment_example"></a>3. Commentarial Annotations</h2>
<p>Commenting on maps or map segments, as shown in Figure 4, is a major use case in Maphub. Users can select and then comment upon map regions. While the uer is writing their comments, the system proposes possibly relevant tags. These tags are in fact links to <a href="http://dbpedia.org/About" title="wiki.dbpedia.org : About">DBPedia</a>, and therefore denoted as Semantic Tags. Accepted tags become part of the annotation.</p>
<p>Figure 4 shows an example commentarial map annotation created in Maphub.</p>
<p>The annotation can be retrieved by executing the following curl request:
<code>curl -H "Accept: text/turtle" http://maphub.herokuapp.com/annotations/4</code>
</p>
<center>
<table width="85%">
<tbody>
<tr>
<th class="exhead">Figure 4. Example Commentarial Annotation.</th>
</tr>
<tr>
<td>
<center>
<img src="./img/maphub_comment_region.jpg" class="example" alt="Commentarial Annotation - Region"/>
</center>
</td>
</tr>
<tr>
<td>
<center>
<img src="./img/maphub_comment.jpg" class="example" alt="Commentarial Annotation - Comment"/>
</center>
</td>
</tr>
</tbody>
</table>
</center>
<p>Figure 5 illustrates how this annotation is represented in the Open Collaboration Model. The annotation text is represented as an<a href="http://www.openannotation.org/spec/core/#InlineBody" title="Open Annotation Draft Data Model">Inline Body</a>, and the semantic tags as <a href="http://www.openannotation.org/spec/extension/#SemanticTag" title="Open Annotation Draft Extension Specification">Semantic Tags</a>. Since the annotation is about part of the map resource, the annotation target is a <a href="http://www.openannotation.org/spec/core/#TargetSpecific" title="Open Annotation Draft Data Model">Specific Target</a>, which is further described by two <a href="http://www.openannotation.org/spec/core/#Selector" title="Open Annotation Draft Data Model">Selector</a> representations: one <a href="http://www.openannotation.org/spec/extension/#SelectorSvg" title="Open Annotation Draft Extension Specification">SVGSelector</a> and a custom Selector that expresses the same information in the <a href="http://en.wikipedia.org/wiki/Well-known_text" title="Well-known text - Wikipedia, the free encyclopedia">Well-known text (WKT)</a> markup language, which is commonly used in geographic information systems.</p>
<center>
<table width="85%">
<tbody><tr>
<th class="exhead">Figure 5. Open Annotation Commentarial Annotation</th>
</tr>
<tr>
<td>
<div class="exsubhead">Model Instance</div>
<center> <img src="./img/maphub_oa_comment.png" class="example" alt="Control Point Example"> </center></td>
</tr>
<tr>
<td>
<div class="exsubhead">Commentarial Annotation - Turtle serialization</div>
<pre class="code">
@prefix ct: <http://www.w3.org/2011/content#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/spec/> .
@prefix oa: <http://www.w3.org/ns/openannotation/core/> .
@prefix oax: <http://www.w3.org/ns/openannotation/extensions/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
<http://maphub.herokuapp.com/annotations/4> a oa:Annotation;
oa:annotated "2012-07-18T02:03:58Z"^^<http://www.w3.org/2001/XMLSchema#dateTime>;
oa:annotator <274c4218-d14b-11e1-b9b2-00163e110825>;
oa:generated "2012-07-18T02:03:58Z"^^<http://www.w3.org/2001/XMLSchema#dateTime>;
oa:generator <http://maphub.herokuapp.com>;
oa:hasBody <275163a6-d14b-11e1-b9b2-00163e110825>;
oa:hasTarget <2751d020-d14b-11e1-b9b2-00163e110825>;
oax:hasSemanticTag <http://dbpedia.org/resource/Mediterranean_Sea>,
<http://dbpedia.org/resource/Strait_of_Gibraltar>,
<http://dbpedia.org/resource/Pillars_of_Hercules>,
<http://dbpedia.org/resource/Gibraltar>,
<http://dbpedia.org/resource/Atlantic_Ocean>,
<http://dbpedia.org/resource/Classical_antiquity>,
<http://dbpedia.org/resource/Ancient_history>,
<http://dbpedia.org/resource/Ancient_Egypt>,
<http://dbpedia.org/resource/Mediterranean_Basin> .
<274c4218-d14b-11e1-b9b2-00163e110825> foaf:mbox "[email protected]";
foaf:name "behas" .
<275163a6-d14b-11e1-b9b2-00163e110825> a ct:ContentAsText;
dcterms:format "text/plain";
ct:chars "In antiquity, the Strait of Gibraltar (which connects the
Atlantic Ocean with the Mediterranean Sea) was also known by the name \"The Pillars
of Hercules\". This is the reason for this inscription!" .
<2751d020-d14b-11e1-b9b2-00163e110825> a oa:SpecificResource;
oa:hasSelector <2752261a-d14b-11e1-b9b2-00163e110825>,
<27527570-d14b-11e1-b9b2-00163e110825>;
oa:hasSource "http://samos.mminf.univie.ac.at/maps/raw/g3200.ct000725C.jp2" .
<2752261a-d14b-11e1-b9b2-00163e110825> a ct:ContentAsText;
dcterms:format "image/svg";
ct:chars """
<?xml version="1.0" standalone="no"?>
<polygon xmlns="http://www.w3.org/2000/svg"
points="5315,5639 5444,5529 5505,5593 5346,5691 5315,5639" />
""" .
<27527570-d14b-11e1-b9b2-00163e110825> a ct:ContentAsText;
dcterms:format "application/wkt";
ct:chars "POLYGON((5315 5639,5444 5529,5505 5593,5346 5691,5315 5639))" .
</pre>
</td>
</tr>
</tbody></table>
</center>
<!-- ANNOTATION INDEX -->
<h2><a id="annotation_index"></a>4. Annotation Index</h2>
<p>Individual Georeference and Commentarial Annotations can be retrieved by dereferencing their HTTP URI, as shown before. To get a list of available annotations, Maphub offers two annotation indices; one for each annotation type. An annotation index is represented in the <a href="http://www.openarchives.org/ore/" title="Open Archives Initiative Protocol - Object Exchange and Reuse">OAI Object Reuse and Exchange</a> model. Figure 6 and 7 show the two indices currently exposed by Maphub.</p>
<p>An annotation index can be retrieved by executing the following curl request:
<br/>
<code>curl http://maphub.herokuapp.com/control_points.rdf</code>
<br/>
<code>curl http://maphub.herokuapp.com/annotations.rdf</code>
<br/>
</p>
<center>
<table width="85%">
<tbody>
<tr>
<th class="exhead">Figure 6. Georeference Annotation Index</th>
</tr>
<tr>
<td>
<center> <img src="./img/maphub_oa_cp_index.png" class="example" alt="Controlpoint Index Example"> </center></td>
</tr>
<tr>
<td>
<div class="exsubhead">Georeference Annotation Index - RDF/XML serialization</div>
<pre class="code">
<?xml version="1.0" encoding="utf-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:ore="http://www.openarchives.org/ore/terms/"
xmlns:dcterms="http://purl.org/dc/terms/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:foaf="http://xmlns.com/foaf/0.1/" >
<rdf:Description rdf:about="http://maphub.herokuapp.com/control_points">
<rdf:type rdf:resource="http://www.openarchives.org/ore/terms/Aggregation"/>
<dc:title>Maphub Controlpoints</dc:title>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/control_points/1"/>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/control_points/2"/>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/control_points/3"/>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/control_points/4"/>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/control_points/9"/>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/control_points/10"/>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/control_points/11"/>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/control_points/12"/>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/control_points/13"/>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/control_points/14"/>
</rdf:Description>
</rdf:RDF>
</pre>
</td>
</tr>
</tbody></table>
</center>
<center>
<table width="85%">
<tbody>
<tr>
<th class="exhead">Figure 7. Commentarial Annotation Index</th>
</tr>
<tr>
<td>
<center> <img src="./img/maphub_oa_ann_index.png" class="example" alt="Annotation Index Example"> </center></td>
</tr>
<tr>
<td>
<div class="exsubhead">Commentarial Annotation Index - RDF/XML serialization</div>
<pre class="code">
<?xml version="1.0" encoding="utf-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:ore="http://www.openarchives.org/ore/terms/"
xmlns:dcterms="http://purl.org/dc/terms/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:foaf="http://xmlns.com/foaf/0.1/" >
<rdf:Description rdf:about="http://maphub.herokuapp.com/annotations">
<rdf:type rdf:resource="http://www.openarchives.org/ore/terms/Aggregation"/>
<dc:title>Maphub Commentarial Annotations</dc:title>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/annotations/1"/>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/annotations/2"/>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/annotations/3"/>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/annotations/4"/>
<ore:aggregates rdf:resource="http://maphub.herokuapp.com/annotations/5"/>
</rdf:Description>
</rdf:RDF>
</pre>
</td>
</tr>
</tbody></table>
</center>
<!-- REFERENCES-->
<a id="references" name="References"></a>
<h2>5. References and Further Information</h2>
<dl>
<dd>Haslhofer, B. Simon, R. Sanderson, R. Van de Sompel, H. (2011.) "<a href="http://eprints.cs.univie.ac.at/3360" title="Open annotations on multimedia Web resources - Faculty of CS Repository">The Open Annotation Collaboration (OAC) Model</a>", Multimedia Tools and Applications, Springer, to appear: 2012</dd>
<br/>
<dd>Simon, R. and Haslhofer, B. and Robitza, W. and Momeni Roochi, E.: <a href="http://eprints.cs.univie.ac.at/2840" title="Semantically Augmented Annotations in Digitized Map Collections - Faculty of CS Repository">Semantically Augmented Annotations in Digitized Map Collections</a>. In: ACM/IEEE Joint Conference on Digital Libraries (JCDL), June 13-17, 2011, Ottawa, Ontario, Canada (2011)</dd>
</dl>
<div class="changelog">
<h2><a id="changelog" name="changelog"></a>A. Change Log</h2>
<table class="changelog" summary="change log">
<tbody>
<tr>
<th>Date</th>
<th>Editor</th>
<th>Description</th>
</tr>
<tr>
<td>2012-07-20</td>
<td>behas</td>
<td>Maphub v.0.3 API documentation</td>
</tr>
</tbody>
</table>
</div>
<br>
<div id="license">
<p><a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/3.0/"><img alt="Creative Commons License" style="border-width:0" src="./img/88x31.png"></a><span xmlns:dct="http://purl.org/dc/terms/" href="http://purl.org/dc/dcmitype/Text" property="dct:title" rel="dct:type">This work is supported </span> by <a xmlns:cc="http://creativecommons.org/ns#" href="http://www.openannotation.org/" property="cc:attributionName" rel="cc:attributionURL">the Open Annotation Collaboration</a> and licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/3.0/">Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License</a>.</p>
</div>
</body>
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