[Volute] r3955 - trunk/projects/edu/edumatters

Volute commit messages volutecommits at g-vo.org
Fri Apr 21 11:17:13 CEST 2017


Author: msdemlei
Date: Fri Apr 21 11:17:13 2017
New Revision: 3955

Log:
edu matters: starting translation to ivoatex.

Added:
   trunk/projects/edu/edumatters/edumatters.tex
      - copied unchanged from r3954, trunk/projects/edu/edumatters/edumatters.html
Deleted:
   trunk/projects/edu/edumatters/edumatters-fmt.html
   trunk/projects/edu/edumatters/edumatters.html
Modified:
   trunk/projects/edu/edumatters/   (props changed)
   trunk/projects/edu/edumatters/DocRegExt-v1.0.xsd

Modified: trunk/projects/edu/edumatters/DocRegExt-v1.0.xsd
==============================================================================
--- trunk/projects/edu/edumatters/DocRegExt-v1.0.xsd	Thu Apr 20 09:24:05 2017	(r3954)
+++ trunk/projects/edu/edumatters/DocRegExt-v1.0.xsd	Fri Apr 21 11:17:13 2017	(r3955)
@@ -21,8 +21,6 @@
   </xs:annotation>
   <xs:import namespace="http://www.ivoa.net/xml/VOResource/v1.0" 
   	schemaLocation="http://www.ivoa.net/xml/VOResource/VOResource-v1.0.xsd"/>
-	<xs:import namespace="http://www.ivoa.net/xml/VOResource/v1.0"
-				schemaLocation="http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource-v1.0.xsd"/>
 
 	<xs:complexType name="Document">
 		<xs:annotation>

Copied: trunk/projects/edu/edumatters/edumatters.tex (from r3954, trunk/projects/edu/edumatters/edumatters.html)
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ trunk/projects/edu/edumatters/edumatters.tex	Fri Apr 21 11:17:13 2017	(r3955, copy of r3954, trunk/projects/edu/edumatters/edumatters.html)
@@ -0,0 +1,631 @@
+<?xml version="1.0"?>
+<!-- $Id:$ 
+Note that this file should be xhtml with div to mark sections - see README for more information
+Paul Harrison -->
+<!DOCTYPE html
+  PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "ivoadoc/xmlcatalog/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<title>Educational Resources in the Virtual Observatory</title>
+<meta http-equiv="content-type" content="text/html; charset=utf-8" />
+<meta name="Title" content="Educational Resources in the Virtual Observatory" />
+<meta name="author" content="Marco Molinaro" />
+<meta name="maintainedBy" content="Marco Molinaro" />
+<link href="http://www.ivoa.net/misc/ivoa_a.css" rel="stylesheet" type="text/css" />
+<link href="./ivoadoc/XMLPrint.css" rel="stylesheet" type="text/css" />
+<link href="./ivoadoc/ivoa-extras.css" rel="stylesheet" type="text/css" />
+
+<style type="text/css" xml:space="preserve">
+table.plain {
+  border-style: none;
+}
+td.even {
+  padding-top: 2px;
+  padding-bottom: 2px;
+  background: #EEEEFF;
+}
+
+.edit {
+	background-color: red;
+}
+</style>
+
+</head>
+<body>
+<div class="head">
+  <div id="titlehead" style="position:relative;height:170px;width: 500px">
+    <div id="logo" style="position:absolute;width:300px;height:169px;left: 50px;top: 0px;">
+    <img src="http://www.ivoa.net/pub/images/IVOA_wb_300.jpg" alt="IVOA logo"/></div>
+    <div id="logo-title"
+         style="position: absolute; width: 200px; height: 115px; left: 320px; top: 5px; font-size: 14pt; color: #005A9C; font-style: italic;">
+      <p style='position: absolute; left: 0px; top: 0px;'><span style='font-weight: bold;'>I</span> nternational</p>
+      <p style='position: absolute; left: 15pt; top: 25pt;'><span style='font-weight: bold;'>V</span> irtual</p>
+      <p style='position: absolute; left: 15pt; top: 50pt;'><span style='font-weight: bold;'>O</span> bservatory</p>
+      <p style='position: absolute; left: 0px; top: 75pt;'><span style='font-weight: bold;'>A</span> lliance</p>
+    </div>
+  </div>
+<h1>Educational Resources in the Virtual Observatory<br/>
+  Version <span class="docversion">0.1</span></h1>
+<h2 class="subtitle">Filled in automatically</h2>
+<dl>
+  <dt>Working Group</dt>
+  <dd><a href="http://wiki.ivoa.net/twiki/bin/view/IVOA/WebHome">Edu IG</a></dd>
+  <dt><b>This version:</b></dt>
+  <dd><a href="" class="currentlink">filled in automatically</a></dd>
+  <dt><b>Latest version:</b></dt>
+  <dd> not issued outside
+    EDU-IG</dd>
+  <dt><b>Previous version(s):</b></dt>
+  <dd> None</dd>
+    <dt><b>Author(s):</b></dt>
+  <dd>Marco Molinaro<br/>
+  Markus Demleitner<br/>
+  Massimo Ramella<br/>
+  Giulia Iafrate</dd>
+</dl>
+
+<h2>Abstract</h2>
+<p>
+The goal of this IVOA Note is to introduce and explain practices followed
+and requirements found while creating and 
+deploying astrophysical resources 
+dedicated to educational purposes within the standard VO framework.
+Issues, proposed solutions and desirables are here reported to be
+possibly taken into account in future modifications of relevant
+standards.
+</p>
+
+<p>In detail, we discuss: the curation of educational resources inside or
+along with standard registries; use cases and techniques for registering
+and locating documents, tutorials and similar within the registries;
+dealing with multiple languages.</p>
+
+<h2> Status of This Document</h2>
+<p id="statusdecl">(updated automatically)</p>
+<p>This is an IVOA Note generated by discussion between Education IG and Registry WG members mainly.</p>
+<p> <em>A list of </em><span style="background: transparent"><a  href="http://www.ivoa.net/Documents/"><i>current
+  IVOA Recommendations and other technical documents</i></a></span><em > can be found at http://www.ivoa.net/Documents/.</em></p>
+<h2 class="prologue-heading-western">Acknowledgements</h2>
+<p>blah</p>
+</div>
+<h2>Contents</h2>
+<div>
+<?toc ?>
+</div>
+
+<div class="body">
+
+<div class="section">
+<h1><a id="Introduction"></a>Introduction</h1>
+<p>
+Advances in technology and communications are creating new and exciting 
+opportunities for teachers to bring astronomy into their 
+classrooms.  As the VO makes science-grade data publicly available and
+classroom sets of (suitably) networked PCs are now standard in schools,
+exciting projects come within reach of teachers.  In order to make things happen
+, it is important to disseminate material to help teachers
+tap into these resources.  These include documented step-by-step
+tutorials, use cases explaining how to perform basic astrophysical research 
+using VO tools and resources, and similar exist in various formats and
+have been translated in different languages.
+</p>
+
+<p>New opportunities also come on the observational side. 
+There is a growing availability of remotely controlled 
+telescopes dedicated to education in many countries world-wide, from the 
+Bradford Robotic Telescope on MountTeide, Tenerife (http://www.telescope.org) 
+to the radio telescopes of the Radio Physics Lab, IUCAA, Pune 
+(http://www.ncra.tifr.res.in/rpl). In some cases, educational telescopes are 
+linked into a network with the aim of guaranteeing the best observing conditions, 
+including deep sky observations during regular daytime school hours, and 
+the best instrument for the particular program of interest. Examples
+of these networks are iTelescope.net (http://www.itelescope.net) and EuHOU-MW 
+(http://euhou.obspm.fr/public).
+</p>
+<p>
+As telescopes enter classrooms more frequently, interest is growing for a 
+public archive of observations and hence for publishing and curation tools, 
+together with the basic applications needed to retrieve, display
+and analyze data. The VO already includes most of the technology needed 
+to satisfy the requests of educational observatories. In fact, since several 
+years, VO, and in particular the European project EuroVO, is devoting part 
+of its resources to education (http://wwwas.oats.inaf.it/aidawp5). It is 
+therefore a natural decision for VO to tackle the problem of publishing 
+educational data in VO archives.
+</p>
+
+<p>Resource registration for both educational data services and documents 
+is the most appropriate approach toward making educational resources 
+available within the VO.  While
+technically this may seem trivial, keeping too technical
+research services out of the the resources devoted to education will
+require some effort, that will also be needed in order to avoid contaminating 
+VO professional research with obviously inadequate material.</p>
+
+<p>In the next section we discuss the idea of educational resources curation, then 
+<a href="#regext">Registering Texts</a> we work out the use cases and needs for
+registration of tutorials and documents. Finally, we discuss the idea of introducing language
+internationalization in the resources.
+</p>
+</div> <!-- section Introduction -->
+
+<div class="section">
+<h2><a id="curreg">A Curated Registry for Education</a></h2>
+<p>
+From a technical point of view the registration of educational services
+does not require extensions
+to the existing for VOResource standard (<cite>std:VOR</cite>).
+The only real need for investigating changes to what already exists is due to a
+use case's distinction between resources to be used in teaching and dissemination
+versus all the research driven resources that exist in the VO.
+</p>
+<p>
+For simplicity here we will distinguish these two groups of resources as
+<i>educational</i> and <i>professional</i> but without any intent of putting them
+on different levels of importance.
+</p>
+<div class="section">
+  <h3><a id="eduvspro">Educational vs. Professional Resources</a></h3>
+  <p>
+  On the one side, teachers and educators may find it difficult to filter out 
+  from all VO resources those that are suitable for their tutorials and
+  examples. On the other side, educational resources should not be retrieved 
+  by a standard professional query.
+  Given that it is not a matter of data quality, but only a distinction upon 
+  the resources' scope, nevertheless this duality leads to an issue about the
+  proper way to tag resources for educational usage.
+  </p>
+  <p>
+  In the next subsection we propose a possible tagging solution, based upon 
+  the existing <i>ContentLevel</i> element of VOResource, but requiring a small change
+  to it. The subsequent subsection describes the idea of a
+  curated registry for educational resources and the reasons for it to exist.
+  </p>
+</div> <!-- subsection eduvspro -->
+
+<div class="section">
+  <h3><a id="contentlvl">ContentLevel granularity issue</a></h3>
+  <p>
+  <cite>std:VOR</cite> already has the <i>ContentLevel</i> element
+  allowing data publishers to optionally identify their resources as being 
+  suitable for one or more of the following audiences:</p>
+  <ul>
+	<li>General</li>
+	<li>Elementary Education</li>
+	<li>Middle School Education</li>
+	<li>Secondary Education</li>
+	<li>Community College</li>
+	<li>University</li>
+	<li>Research</li>
+	<li>Amateur</li>
+	<li>Informal Education</li>
+  </ul>
+  <p>This element turns out to be misused by many publishers, presumably because
+  it is not really clear what the subtle differences between the available
+  possibilities are; also, to require a fairly substantial enumeration to
+  convey "for school use" seems, in retrospect, not likely to promote
+  widespread adoption. We hence propose to simplify the content model
+  to:</p>
+  <ul>
+	<li>General</li>
+	<li>Research</li>
+	<li>Amateur</li>
+  </ul>
+  <p>We expect this to reach two goals:
+  <ul>
+    <li>to make publishers to better describe (on the average)
+    their resources</li>
+    <li>to providing a tagging solution that suits a first filtering 
+    on the resources at client level</li>
+  </ul>
+  Of course, the chance to 
+  add an <i>Educational</i> value option to this shrinked list, or even
+  substitute it to the <i>General</i> one, would be a valuable change.
+  </p>
+  <p>
+  This change in the already existing standard will require only 
+  a small effort to update already registered resources because nearly 97% of 
+  them currently have ContentLevel set to <i>research</i>, about 2% of them have
+  no ContentLevel defined at all and only the remaining have a different value
+  (or set of values) set for this element (Appendix A details better these
+  figures).
+  </p>
+  <p>Until the change in VOResource can be performed, it
+  can work as a "best practice" recommendation, possibly even at a
+  registry level, where registries can map existing <i>ContentLevel</i>s values 
+  of <i>University</i> to <i>Research</i> and
+  everything else except <i>Amateur</i> to <i>General</i>.</p>
+</div> <!-- subsection contentlvl -->
+
+<div class="section">
+  <h3><a id="edureg">Curating the Edu Registry</a></h3>
+  <p>
+  Even in the case of the simplified <i>ContentLevel</i> tagging system
+  a curated registry for educational VO resources will be useful for
+  educators in order to let their students work with a registry without having to
+  worry about confusing material or overwhelming data sizes. A good example
+  for this is the educational version of the Aladin sky atlas that has a
+  built in, curated set of resources suitable for educational level 
+  tutorials.
+  </p>
+  <p>
+  Curation will require some effort in managing and keeping up to date
+  such a registry but, most important, it is subjected to  some restrictions coming from
+  the IVOA resource registry architecture. 
+  </p>
+  <p>
+  If such a registry were a standard publishing registry
+  (<cite>std:RI1</cite>),
+  its resources would be harvested by the full registries: this means 
+  that any dedicated educational resource would end up in the full VO 
+  set of resources.  For reasons mentioned above, this is not
+  desirable.</p>
+  <p>
+  If it were to be a full registry, it will harvest itself all the existing
+  resources, and not all of them will fit, or be suitable for, the educational
+  scope the registry has to be preserved for.
+  </p>
+  <p>
+  We need a resource (the curated, in <cite>std:RI1</cite>
+  parlance, local, registry) capable of :
+  <ul>
+	<li><i>selectively</i> harvesting the existing VO resources 
+	(e.g. from a full registry);</li>
+	<li>register its own educational resources without being directly
+	harvested by full registries (e.g. this could be done using a
+	sibling publishing registry dedicated to host those educational
+	resources that are to be harvested by the standard full registries.</li>
+  </ul>
+  This solution, also presented in Fig. 1, will not touch the existing architecture
+  while giving flexibility for the emerging educational resources to 
+  be curated.
+  </p>
+  <div class="figure" style="text-align: center;">
+    <img src="curation.png"></img>
+    <p class="figurecaption"><strong>Figure 1:</strong> Graphic illustration
+    of the connecting interfaces between full registries and the educational
+    curated one. The <i>auxiliary</i> publishing is the only automatic token
+    from the edu part.</p>  
+  </div><!-- figure -->
+</div> <!-- subsection edureg -->
+
+</div> <!-- section curreg -->
+
+<div class="section">
+<h2><a id="regext">Registering Texts</a></h2>
+<p>Educational material is not only about services – text-like material
+like tutorials, worked-out use cases, or textbook-like material are at
+least as important.  Within the VO community, there is a large body of
+educational material for a wide variety of audiences ranging from pre-school to
+researchers:
+<ul>
+<li>EURO-VO AIDA WP5 - http://wwwas.oats.inaf.it/aidawp5/eng_download.html</li>
+<li>EURO-VO Scientific Tutorials - http://www.euro-vo.org/?q=science/scientific-tutorials</li>
+<li>VAO for Education - http://virtualobservatory.org/education/</li>
+</ul>
+</p>
+
+<p>To date, such material has been collected informally by the various
+projects on plain web pages.  It is, in consequence, hard to find, with
+knowledge of it often passed on antecdotically. In order to improve upon 
+this situation, we
+propose to keep record of educational material in the registry.</p>
+
+<p>The VO already has a registry extension for standards, which of
+course are also text-like (<cite>std:STDREGEXT</cite>).  This extension,
+however, focuses on metadata important for standards – e.g.,
+vocabularies and status – that is not pertinent for educational
+material.  Conversely, it is not concerned with document language (which
+can safely be assumed to be English for standards), and it disregards
+the issue of locating formatted and source version, which for educational
+material is important.  We therefore propose a simple registry extension
+covering text-like material, dubbed DocRegExt.</p>
+
+
+<div class="section">
+<h3><a id="regext-usecases">Use Cases</a></h3>
+
+<p>The design of DocRegExt has been guided by the desire to fulfill the
+following use cases:</p>
+
+<ul>
+<li>Is there a tutorial covering discovering intermediate mass black
+holes? (Standard VOResource is sufficient)</li>
+<li>Is there a tutorial covering working with X-Ray data? (Standard
+VOResource is sufficient)</li>
+<li>Is there a tutorial dealing with Planets suitable for school use?
+(Standard VOResource is sufficient)</li>
+<li>Is there a tutorial dealing with Planets suitable for school use in
+Italian? (That requires the declaration of the document language)</li>
+<li>What are the subjects of maintained (in the sense of: probably
+working in the VO as found by the students) tutorials?
+(The active flag of standard VOResource is
+unsuitable here since even outdated resources will still be accessible;
+therefore, we introduce the maintained flag)</li>
+<li>Are there tutorials using redshifts? (This is solved by allowing
+table metadata in DocRegExt)</li>
+<li>Where can I find an editable version of tutorial ivo://auth/tut1?
+(This is solved by allowing multiple access URLs with different content
+types, which should be sufficient to allow answering the question)</li>
+<li>Are there translations of tutorial ivo://auth/tut2? (This is covered
+by the recommendations on declaring relationships between text-like
+resources)</li>
+<li>Is there material using service ivo://auth/svc1? (Again, declaring
+relationships covers this use case)</li>
+<li>Is there material about something visible tonight? (In principle,
+allowing the coverage element withing DocRegExt resources would allow
+answering the question; in reality, few registries expose this
+information in useable form)</li>
+<li>I found this VO tutorial somewhere on the net ("on a mirror").  Is it
+the latest version?  If not, where can I find an update? (Unless the
+title of the text changed, standard VOResource should suffice)</li>
+</ul>
+
+<p>On the use cases of locating editable forms of such texts – which
+has been found to be necessary fairly regularly – we note in passing
+that representing source-product relationships is in principle in the
+domain of provenance and thus not in scope for the registry. However, in
+the case discussed here the relation is so simple and its representation
+so useful that we propose to include it in a DocRegExt.</p>
+
+</div> <!-- section regext-usecases -->
+
+
+<div class="section">
+<h3><a id="regext-ext">A Document Registry Extension</a></h3>
+
+<p>To satisfy our use cases, we have designed a registry extension with
+a single definition, extending the basic <code>vr:Resource</code>
+element with three concepts to make the <code>doc:Document</code>
+resource type.</p>
+
+<?schemadef href="../DocRegExt-v1.0.xsd" defn="Document"?>
+
+<p>The full schema is given in Appendix <span
+class="xref">app:schema</span></p>
+
+<p>We considered  having language as an attribute of accessURL to allow
+language-specific document discovery.  We decided against this mainly
+for reasons of maintainability; the same reason is behind the
+recommendation to have both access and source URLs as landing pages.</p>
+
+<p>Since the access URL is supposed to point to a "landing page" anyway,
+it is tempting to just unify it with the standard VOResource reference
+URL. As a "human-readable document describing this resource"
+<cite>std:VOR</cite> quite conceivably could very well work as a landing
+page.  For many documents having identical access and reference, urls
+will certainly work fine.  However, we want to cover the cases in
+which different projects offer different translations or even versions
+of a document at different sites, which is not possible with just a
+single reference URL.  A similar reasoning is behind including source
+URIs, except that in this case we wanted to allow URIs with non-HTTP
+schemes like svn or git.</p>
+
+<p>Document-typed resource records should define relations to other
+general resources (e.g. applications, services, ...) 
+they use; since an extension of the vocabulary allowed for relationship types
+in VOResource will probably not be possible in the near future,
+we suggest the relationshipType for these relations should be
+<code>related-to</code>.  If a relation <code>uses</code> becomes available
+in the future, it should be used in this situation.</p>
+
+<p class="edit">TBD: do we want i18n-ed titles?</p>
+
+<p>In the relational registry <cite>std:REGTAP</cite>, DocRegExt is
+entirely represented in the <code>res_details</code>, with details</p>
+<ul>
+<li><code>/language</code> -- A language the document is available in.</li>
+<li><code>/accessURL</code> -- A URL allowing access to one or more
+renderings of the document.</li>
+<li><code>/sourceURI</code> -- A URL allowing access to an editable version of the document.</li>
+</ul>
+
+<p>Here is a (slightly abridged) example record:</p>
+
+<?incxml href="../m1distance-example.xml"?>
+
+<p class="edit">TBD: should we use ISO-3166-1 two letter 
+country codes or ISO-639-2 two letter language codes?<br/>
+MMo: I vote for 639-2. This shouldn't require changes now, 
+but it's better to clarify it in advance IMHO.
+</p>
+
+</div> <!-- subsection regext-ext -->
+
+<div class="section">
+<h3><a id="svn-repo">A versioned repository for tutorials</a></h3>
+<p>Registering text document as VO resources allows search for tutorials and other 
+materials through standard registry interfaces, but keeping 
+tutorials up to date, in their master form and also in their translated 
+versions, is another important issue to allow proficient use.<br/>
+A versioned repository (using subversion as the version control system) 
+has been set up at GAVO data center (
+http://svn.ari.uni-heidelberg.de/svn/edu/) and collects part of the
+already existing VO tutorials with the goal of preserve them and let users 
+update and translate them in favour of the whole community.<br/>
+The repository has an internal structure that takes care for:
+<ul>
+  <li>different national languages (master language set to english)</li>
+  <li>translation vs. master language updates</li>
+  <li>licensing, in order to clarify how and whether a tutorial can be changed or re-used</li>
+  <li>additional materials used by tutorials</li>
+  <li>access roles to allow everyone to access tutorials but prevent untrusted updates or additions to it</li>
+</ul>
+The repository is intended to work as a space for cooperative 
+VO tutorials development.
+
+</p>
+</div> <!-- subsection svn-repo -->
+
+</div> <!-- section regext -->
+
+<div class="section">
+<h2><a id="lang">Internationalization of VO Resources</a></h2>
+<p>
+The EURO-VO AIDA project WP5 produced multilingual tutorials, 
+meeting the needs for high schools and lower level 
+educational degrees in countries where English is not the native language. 
+Clearly, it would be an added value to be able to register an educational or
+document resource not only in english (as it is done currently with 
+standard VO resources) but also in other national languages.
+</p>
+<p>
+Here we propose discuss whether this means:
+<ul>
+  <li>changing VOResource to allow different languages in resource 
+  descriptions;</li>
+  <li>enable internazionalization in VO resources within existing
+  resources: one resource described in multiple languages</li>
+  <li>other...</li>
+</ul>
+</p>
+</div> <!-- section lang -->
+
+</div> <!-- body -->
+
+<div class="appendices">
+<div class="section">
+<h2><a id="clcurrval">ContentLevel values summary</a></h2>
+<p>
+This appendix reports some statistics on the usage of the ContentLevel 
+element in <cite>std:VOR</cite> as of 2014-01-30, taken from the
+GAVO RegTAP endpoint http://dc.g-vo.org/tap .
+There are 14392 useful resources (excluding authorities, standards and
+similar) that expose 26 different values as their ContentLevel.
+In the following table these values are reported in order of count.
+</p>
+<p>
+<table class="plain">
+<thead>
+<tr>
+ <th>count</th> <th>content_level string</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+ <td>13937</td> <td>research</td>
+</tr>
+<tr>
+ <td>290</td> <td> </td>
+</tr>
+<tr>
+ <td>41</td> <td>university#research</td>
+</tr>
+<tr>
+ <td>40</td> <td>general#university#research#amateur</td>
+</tr>
+<tr>
+ <td>24</td> <td>university</td>
+</tr>
+<tr>
+ <td>14</td> <td>university#research#amateur</td>
+</tr>
+<tr>
+ <td>7</td> <td>general</td>
+</tr>
+<tr>
+ <td>5</td> <td>research#general</td>
+</tr>
+<tr>
+ <td>4</td> <td>general#research</td>
+</tr>
+<tr>
+ <td>3</td> <td>secondary education#community college#university#research#amateur</td>
+</tr>
+<tr>
+ <td>3</td> <td>research#university#community college</td>
+</tr>
+<tr>
+ <td>3</td> <td>elementary education#middle school education#secondary education</td>
+</tr>
+<tr>
+ <td>3</td> <td>general#university#research</td>
+</tr>
+<tr>
+ <td>2</td> <td>research#university</td>
+</tr>
+<tr>
+ <td>2</td> <td>research#amateur#university#community college</td>
+</tr>
+<tr>
+ <td>2</td> <td>general#informal education</td>
+</tr>
+<tr>
+ <td>2</td> <td>general#elementary education#middle school education#secondary education#community college#university#research#amateur#informal education</td>
+</tr>
+<tr>
+ <td>1</td> <td>university#community college#research</td>
+</tr>
+<tr>
+ <td>1</td> <td>general#university#research#amateur#informal education</td>
+</tr>
+<tr>
+ <td>1</td> <td>elementary education#middle school education#secondary education#community college#university#research</td>
+</tr>
+<tr>
+ <td>1</td> <td>general#secondary education#university#research</td>
+</tr>
+<tr>
+ <td>1</td> <td>university#research#general#informal education</td>
+</tr>
+<tr>
+ <td>1</td> <td>research#university#amateur</td>
+</tr>
+<tr>
+ <td>1</td> <td>elementary education#middle school education#secondary education#community college#university#research#amateur</td>
+</tr>
+<tr>
+ <td>1</td> <td>elementary education#middle school education#secondary education#community college#university#research#amateur#informal education</td>
+</tr>
+<tr>
+ <td>1</td> <td>university#research#amateur#informal education</td>
+</tr>
+<tr>
+ <td>1</td> <td>general#university#research#informal education</td>
+</tr>
+</tbody>
+</table>
+</p>
+<p>
+This table can be easily updated from the same endpoint (or an analogue 
+one) using the following ADQL query:
+<pre>
+SELECT 
+  count(*) as cnt, content_level
+FROM 
+  rr.resource
+WHERE
+  res_type != 'vstd:servicestandard' and 
+  res_type != 'vg:authority' and 
+  res_type != 'vstd:standard' and 
+  res_type != 'va:application' and
+  res_type != 'vr:organization'
+GROUP BY content_level
+ORDER BY cnt DESC
+</pre>
+The table shows that only about 1% of the ContentLevel values use 
+something different and more complex than <i>research</i>, when 
+the element is not empty. Morever, of this 1% (165 resources), 
+61 include the <i>general</i> value (roughly 37% of them), 
+29 (17%) state that are devoted to some <i>education</i> level only,
+while 148 (90%) state that are also devoted to some <i>education</i> level (up to <i>university</i>).
+</p>
+</div> <!-- end clcurrval-->
+
+<div class="section">
+<h2><a id="app:schema">The proposed DocRegExt Schema</a></h2>
+<?incxml href="../DocRegExt-v1.0.xsd"?>
+
+</div> <!-- app:schema -->
+</div> <!-- end appendices -->
+
+<div class="section-nonum">
+<h2><a id="references"/><span class="secnum"/>References</h2>
+
+<?bibliography ivoadoc/refs?>
+
+</div> <!-- section references -->
+
+<hr/>
+</body>
+</html>


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