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KHelpCenter documentation meta data structure
=============================================
KHelpCenter uses meta data files which describe the documentation available in
the system. Each document is represented by a meta data file and shown as an
entry in the KHelpCenter navigation tree view. The meta data contains
information about title and short description of the document, the location of
the document and some more information like how to search the document and
translations of title and description. Document hierarchy is represented as
hierarchy of the meta data files. Directories are also described by a meta data
file which contains the same information as a document meta data file.
Format of the meta data files
-----------------------------
The meta files adhere to the Desktop Entry Standard
(http://www.freedesktop.org/Standards/desktop-entry-spec). Documentation
specific extensions are covered by an own namespace using the prefix "X-DOC-".
The following table describes all keys which are currently used by
KHelpCenter:
Key Value Description
Name string Title of document
Name[xx] string Translated title for language xx
Comment string Short description of document
Comment[xx] string Translated short description for
Language xx
Icon string Name of icon for document
DocPath URI Location of document. In addition to the
standard URI schemes like http: and file:
all schemes which are supported through
kioslaves can be used. In particular the
following non-standard URI schemes are
supported:
help: KDE manual identified by app name
ghelp: GNOME manual identified by app name
man: man page
info: info page
cgi: output of CGI script
DocPath[xx] URI Language specific location for
language xx
Lang langcode Language of document
X-DOC-Identifier string Unique identifier for document, if this
entry is not present the base name of the
file is used as identifier
X-DOC-Indexer command Command used for creating a search index
for the document.
The following symbols are replaced by the
corresponding values:
%f - Filename
X-DOC-IndexTestFile filename Name of file whose existence indicates
the existence of a usable search index
X-DOC-Search command Command used for searching, the output
of the command should be HTML which is
shown in KHelpCenter.
The following symbols in the command are
replaced by the corresponding values:
%k - Words to be searched for
%n - Maximum number of results
%m - Method for combining search words,
can be 'and' or 'or'
%l - Language of documents to be searched
%s - Scope of search. This is a list of
identifiers as given by the
X-DOC-Identifier entry or the bas
name of the desktop file if not
present.
X-DOC-SearchMethod string If this entry is 'htdig' htdig is used to
index and search the document. The
Indexer, IndexTestFile and Search entries
aren't required in this case.
X-DOC-SearchEnabledDefault bool If set to 'true' the document is searched
by default, if set to 'false' it is not.
This setting is overridden by user
selected search scopes.
X-DOC-Weight int A number indicating the position of the
document within the list of siblings. A
greater weight indicates that the document
is 'heavier', thus shown below 'lighter'
documents. The default weight is 0.
X-KDE-KHelpcenter string If this entry is set to one of the
following values a set of documents
generated by other means than desktop file
meta info is inserted at the place
specified by the desktop file:
'apps' manuals of applications
from the start menu
'scrollkeeper' scrollkeeper docs
'applets' panel applet docs
'kinfocenter' kinfocenter docs
'kcontrol' kcontrol module docs
'konqueror' konqueror plugin docs
'kioslave' kioslave docs
'info' info pages
X-DOC-DocumentType string Type of document. The type is used to look
up corresponding search handlers.
Meta File Location
------------------
A list of directories given by the config entry "MetaInfoDirs" in the "General"
group of the help center configuration file "khelpcenterrc" (at
$TDEDIRS/share/config) is scanned for desktop files. They are merged to a common
hierarchy. If the "MetaInfoDirs" entry is empty the directory at
$TDEDIRS/share/apps/khelpcenter/plugins is used.
Document Hierarchy
------------------
The hierarchy of the documents shown in the help center is reflected by the
hierarchy of the desktop files in the filesystem. Directories can have an
associated desktop file with the name ".directory". It can contain all the
keys described above.
Language handling
-----------------
In addition to translation of meta information like title and short description
of documents which is contained in the meta file, translations of whole
documents are handled. Each translation of a document has an own desktop file.
The language of the document is indicated by adding the language code as
additional suffix to the the filename of the desktop file. The language suffix
is added before the ".desktop" suffix (Example: 'apache.de.desktop' would be the
file name for the german translation of the apache documentation).
KHelpCenter shows only the documents whose language is contained in the list of
used languages configured for the desktop in the control center. A document
corresponding to a desktop file without language suffix is always shown.
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