Add missing abstracts for the demo samples.

data/test/IDL10.xml

@@ -41,6 +41,7 @@
          </sourceDesc>
       </fileDesc>
       <profileDesc>
+         <abstract><p>A 16th century manuscript letter of Mauritius Ferber with a collapsible metadata panel in addition to the parallel transcription and facsimile view.</p></abstract>
          <textClass>
             <catRef scheme="#genre" target="#correspondence"/>
             <catRef scheme="#form" target="#manuscript"/>

data/test/adagia.xml

@@ -90,6 +90,7 @@
          </listPrefixDef>
       </encodingDesc>
       <profileDesc>
+         <abstract><p>Adagia by Erasmus of Rotterdam from Early English Books Online (EEBO-TCP) collection.</p></abstract>
          <langUsage>
             <language ident="en">English</language>
          </langUsage>

data/test/adagia_sample.xml

@@ -25,6 +25,7 @@
          </sourceDesc>
       </fileDesc>
       <profileDesc>
+         <abstract><p>Adagium 203 with English and Polish translations. Corresponding sections are highlighted on hover.</p></abstract>
          <textClass>
             <catRef scheme="#genre" target="#correspondence"/>
             <catRef scheme="#form" target="#print"/>

data/test/ebbe.xml

@@ -30,6 +30,10 @@
          </sourceDesc>
       </fileDesc>
       <profileDesc>
+         <abstract>
+            <p>For a taste of less common encoding style: a printed bibliography where TEI encoding aims to provide a basic researchable structure to somewhat idiosyncratic attitude of the 19th century scholar.
+               Presented with a side-by-side facsimile.</p>
+         </abstract>
          <textClass>
             <catRef scheme="#form" target="#print"/>
             <catRef scheme="#genre" target="#lexicography"/>

data/test/graves6.xml

@@ -53,6 +53,10 @@
             </sourceDesc>
         </fileDesc>
         <profileDesc>
+            <abstract>
+                <p>A 20th century manuscript letter from Robert Graves where emphasis has been put on visualizing rich encoding 
+                    of semantic information in the letter, in particular geographic and prosopographical data. The map is displayed with a <code>pb-leaflet</code> component.</p>
+             </abstract>
             <textClass>
                 <catRef scheme="#genre" target="#correspondence"/>
                 <catRef scheme="#form" target="#manuscript"/>

data/test/lelewel1.xml

@@ -17,6 +17,11 @@
          </sourceDesc>
       </fileDesc>
       <profileDesc>
+         <abstract>
+            <p>
+               An early 19th century letter of a Polish historian Joachim Lelewel to his brother showcases possibly the simplest way of encoding and displaying facsimiles: with complete URLs given in pb/@facs attribute. It also demonstrates how TEI encoding of hyphenated words could be processed for display in diplomatic vs normalized view.
+            </p>
+         </abstract>
          <langUsage>
             <language ident="pl">Polish</language>
          </langUsage>

data/test/let695.xml

@@ -65,6 +65,10 @@
       </sourceDesc>
     </fileDesc>
     <profileDesc>
+      <abstract>
+        <p>A letter from Van Gogh to Paul Gauguin written in 1888. This intentionally reproduces the flexible column layout pioneered by the Vincent Van Gogh Letters online edition, which is a model example for correspondence.</p>
+        <p>The source encoding makes use of custom Van Gogh project namespace along the TEI structure. Alignment between original text and translation is achieved with a custom mapping function which leverages the conventions applied when assigning page identifiers in Van Gogh project.</p>
+      </abstract>
       <textClass>
         <catRef scheme="#genre" target="#correspondence"/>
         <catRef scheme="#form" target="#manuscript"/>

data/test/orlik_to_serafin.xml

@@ -42,7 +42,9 @@
          </sourceDesc>
       </fileDesc>
       <profileDesc>
-         <abstract><p>Demonstrates aligning the transcription with a translation on the segment level. Both are contained in the same document and selected via an XPath expression passed to the <tag>pb-view</tag>. The corresponding segments are highlighted on mouseover.</p></abstract>
+         <abstract><p>
+            A 15th century manuscript letter to Mikołaj Orlik demonstrating alignment between Latin original and parallel Polish translation on the segment level. Both are contained in the same document and selected via an XPath expression passed to the <tag>pb-view</tag>. The corresponding segments are highlighted on mouseover.</p>
+         </abstract>
          <textClass>
             <catRef scheme="#genre" target="#correspondence"/>
             <catRef scheme="#form" target="#manuscript"/>

data/test/osinski.xml

@@ -28,6 +28,9 @@
          </sourceDesc>
       </fileDesc>
       <profileDesc>
+         <abstract>
+            <p>A manuscript collocative dictionary of Polish <hi>Bogactwa mowy polskiej</hi> featuring interactive highlights for regions of interest of the facsimile when hovering over dictionary headwords. Internal composition is based on the entryFree element with a rich microstructure.</p>
+         </abstract>
          <textClass>
             <catRef scheme="#genre" target="#lexicography"/>
             <catRef scheme="#form" target="#manuscript"/>

data/test/potocki.xml

@@ -25,6 +25,22 @@
          </sourceDesc>
       </fileDesc>
       <profileDesc>
+         <abstract>
+            <p>
+               This is a prototype for a multiaspect edition of a collection of 17th century poems, <hi>Moralia</hi>. 
+               Most of these short texts have been to a lesser or greater extent based on famous <hi>Adagia</hi> by Erasmus of Rotterdam.
+               </p>
+               <p>
+               The TEI encoding preserves original spelling and punctuation along their normalized forms as well as 
+               physical structure of the manuscript lines and pages and their correspondence with the facsimile.
+               Extensive commentary is given at various granularities: as an introductory article to each of the pieces as a whole, as well as
+               for smaller sections of interest, exploring various connections between the edited text, Adagia, and works of classical authors referred to by Erasmus or Potocki.
+               Finally, at the linguistic level, archaic words or phrases are also elucidated and linked to external resources.
+            </p>
+            <p>
+               Display of these various levels of information can be controlled by the reader thanks to collapsible sections and <code>pb-toggle-feature</code> components.
+            </p>
+         </abstract>
          <particDesc>
             <listPerson>
                <person xml:id="gnd-118595091">