Improvements to digiKam doc [attached]

[Antoni Bella Pérez]

  Hi,

  I have identified the entities and tags that we can use (see the attachment). 
I advise defining five in the header of the index.docbook file, they are very 
commonly used:

    - <!ENTITY > -> Include in the header and use the entity name.
    - &name; -> It is already included in KDE.
    - <acronym> -> Use the tags directly.

  It also requires the need to add keywords (index.docbook file):

    </keywordset>
      <keyword>photography</keyword>
      <keyword>photographer</keyword>
      <keyword>...</keyword>
    </keywordset>

  Regards
  Toni
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Metadata:
  EXIF  -> <!ENTITY Exif    "<acronym>Exif</acronym>"> <!-- Exchangeable image file format -->
  IPTC  -> <!ENTITY IPTC    "<acronym>IPTC</acronym>"> <!-- International Press Telecommunications Council -->
  XMP   -> <!ENTITY XMP     "<acronym>XMP</acronym>"> <!-- Extensible Metadata Platform -->
Data Bases:
  MariaDB   -> <application>MariaDB</application>
  MySQL     -> <application>MySQL</application>
  SQLite    -> <application>SQLite</application>
  SQL       -> <acronym>SQL</acronym>
Image formats:
  DNG       -> <acronym>DNG</acronym>       <!-- Digital Negative -->
  GIF       -> <acronym>GIF</acronym>       <!-- Graphics Interchange Format -->
  JPEG      -> <acronym>JPEG</acronym>      <!-- Joint Photographic Experts Group -->
  JPEG.?2000-> <acronym>JPEG 2000</acronym> <!-- JPEG modified year 2000 -->
  PGF       -> <acronym>PGF</acronym>       <!-- Portable Graphics Format -->
  PNG       -> <!ENTITY PNG         "<acronym>PNG</acronym>"> <!-- Portable Network Graphics -->
  RAW       -> <!ENTITY RAW         "<acronym>RAW</acronym>"> <!-- Image File Format -->
  TIFF      -> <acronym>TIFF</acronym>      <!-- Tagged Image File Format -->
  TIFF/EP   -> <acronym>TIFF/EP</acronym>   <!-- Image format ISO 12234-2 -->
  WebP      -> <acronym>WebP</acronym>      <!-- Image format -->
File systems/format, hardware related:
  Blue Ray  -> <acronym><trademark>Blu-ray</trademark></acronym>
  BTRFS     -> <acronym>Btrfs</acronym>     <!-- B-tree file system -->
  CD        -> &CD;                         <!-- <acronym>CD</acronym> -->
  DVD       -> &DVD;                        <!-- <acronym>DVD</acronym> -->
  ext2      -> <acronym>ext2</acronym>      <!-- Second extended filesystem -->
  fat16     -> <acronym><trademark>fat16</trademark></acronym>      <!-- File Allocation Table -->
  ECC       -> <acronym>ECC</acronym>       <!-- Error-correcting code -->
  HDD       -> <acronym>HDD</acronym>       <!-- Hard disk drive -->
  HTML      -> &HTML;                       <!-- <acronym>HTML</acronym> -->
  PDF       -> &PDF;                        <!-- <acronym>PDF</acronym> -->
  SSD       -> <acronym>SSD</acronym>       <!-- Solid-state drive -->
  XML       -> &XML;                        <!-- <acronym>XML</acronym> -->
  ZFS       -> <acronym><trademark>ZFS</trademark></acronym>        <!-- Zettabyte File System -->
Operative systems:
  archlinux -> <trademark>Arch Linux</trademark>">                  <!-- https://www.archlinux.org/ -->
  Mac       -> &Mac;                        <!-- <trademark class="registered">Mac</trademark> -->
  MacOS     -> &MacOS;                      <!-- <trademark class="registered">Mac</trademark> <acronym>OS</acronym> -->
  Microsoft                 -> &Microsoft;  <!-- <trademark class="registered">Microsoft</trademark> -->
  Microsoft OS              -> &Microsoft;  <acronym>OS</acronym>
  Microsoft Windows         -> &Microsoft;  &Windows;
  MSoffice  -> <application>Microsoft Office</application>
  Linux     -> &Linux;                      <!-- and non-&Linux; form -->
  OS X      -> <trademark>OS X</trademark>  <!-- https://en.wikipedia.org/wiki/MacOS -->
  Solaris   -> &Solaris;                    <!-- <trademark>Solaris</trademark> -->
  SunOS     -> <trademark>SunOS</trademark> <!-- https://en.wikipedia.org/wiki/SunOS -->
  Windows   -> &Windows;                    <!-- <trademark class="registered">Windows</trademark> -->
Misc:
  CIELAB    -> <acronym>CIELAB</acronym>    <!-- Color space -->
  CIEXYZ    -> <acronym>CIEXYZ</acronym>    <!-- Color space -->
  CRT       -> <acronym>CRT</acronym>       <!-- Cathode Ray Tube -->
  DAM       -> <acronym>DAM</acronym>       <!-- Digital Asset Management -->
  DCMI      -> <acronym>DCMI</acronym>      <!-- Dublin Core Metadata Initiative -->
  HP        -> &HP;                         <!-- <trademark class="registered">HP</trademark> -->
  Hewlett.?Packard          -> &Hewlett-Packard;        <!-- <trademark class="registered">Hewlett-Packard</trademark> -->
  Oracle    -> <trademark>Oracle</trademark>            <!-- https://www.oracle.com -->
  PCS       -> <acronym>PCS</acronym>       <!-- Profile Connection Space -->
  PSD       -> <acronym>PSD</acronym>       <!-- Photoshop Document -->
  RDF       -> <acronym>RDF</acronym>       <!-- Resource Description Framework -->
  RGB       -> <acronym>RGB</acronym>       <!-- Color model -->
  sRGB      -> <acronym>sRGB</acronym>      <!-- Color space -->
  W3C       -> <acronym>W3C</acronym>       <!-- World Wide Web Consortium -->
  Adobe     -> <trademark>Adobe</trademark> <!-- http://www.adobe.com -->
  Adobe Illustrator         -> <trademark>Adobe</trademark>">   <!-- http://www.adobe.com -->
  Adobe Systems             -> <trademark>Adobe Systems</trademark>">
  Amazon                    -> <trademark>Amazon</trademark>    <!-- https://www.amazon.com -->
  PostScript                -> &PostScript; <!-- <trademark class="registered">PostScript</trademark> -->
  Sun Microsystems          -> <trademark>Sun Microsystems</trademark> <!-- https://www.oracle.com/sun/index.html -->