fixed anchor link naming, indentation in some places, added the <hr> divisor, fixed the <>& removal in sample XRC and C++ code, wrapped long lines

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52068 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Francesco Montorsi
2008-02-25 00:03:35 +00:00
parent 0d801d09f9
commit e244be154e

View File

@@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////////
// Name: xrc
// Name: xrc.h
// Purpose: topic overview
// Author: wxWidgets team
// RCS-ID: $Id$
@@ -11,11 +11,12 @@
@page overview_xrc XML-based resource system overview
Classes: #wxXmlResource, #wxXmlResourceHandler
The XML-based resource system, known as XRC, allows user interface elements such as
dialogs, menu bars and toolbars, to be stored in text files and loaded into
the application at run-time. XRC files can also be compiled into binary XRS files or C++
code (the former makes it possible to store all resources in a single file and the latter
is useful when you want to embed the resources into the executable).
The XML-based resource system, known as XRC, allows user interface elements such
as dialogs, menu bars and toolbars, to be stored in text files and loaded into
the application at run-time. XRC files can also be compiled into binary XRS files
or C++ code (the former makes it possible to store all resources in a single file
and the latter is useful when you want to embed the resources into the executable).
There are several advantages to using XRC resources.
@@ -24,79 +25,87 @@
@li If you use a dialog designer that generates C++ code, it can be hard
to reintegrate this into existing C++ code. Separation of resources and code
is a more elegant solution.
@li You can choose between different alternative resource files at run time, if necessary.
@li You can choose between different alternative resource files at run time,
if necessary.
@li The XRC format uses sizers for flexibility, allowing dialogs to be resizable
and highly portable.
@li The XRC format is a wxWidgets standard,
and can be generated or postprocessed by any program that understands it. As it is based
on the XML standard, existing XML editors can be used for simple editing purposes.
and can be generated or postprocessed by any program that understands it.
As it is basedon the XML standard, existing XML editors can be used for
simple editing purposes.
XRC was written by Vaclav Slavik.
@li @ref overview_xrcconcepts
@li @ref overview_binaryresourcefiles
@li @ref overview_embeddedresource
@li @ref overview_xrccppsample
@li @ref overview_xrcsample
@li @ref overview_xrcfileformat
@li @ref overview_xrccppheader
@li @ref overview_newresourcehandlers
@li @ref overview_xrc_concepts
@li @ref overview_xrc_binaryresourcefiles
@li @ref overview_xrc_embeddedresource
@li @ref overview_xrc_cppsample
@li @ref overview_xrc_sample
@li @ref overview_xrc_fileformat
@li @ref overview_xrc_cppheader
@li @ref overview_xrc_newresourcehandlers
@section overview_xrcconcepts XRC concepts
<hr>
@section overview_xrc_concepts XRC concepts
These are the typical steps for using XRC files in your application.
@li Include the appropriate headers: normally "wx/xrc/xmlres.h" will suffice;
@li If you are going to use @ref binaryresourcefiles_overview, install
@li If you are going to use XRS files (see @ref overview_xrc_binaryresourcefiles), install
wxFileSystem archive handler first with @c wxFileSystem::AddHandler(new wxArchiveFSHandler);
@li call @c wxXmlResource::Get()-InitAllHandlers() from your wxApp::OnInit function,
and then call @c wxXmlResource::Get()-Load("myfile.xrc") to load the resource file;
@li call @c wxXmlResource::Get()->InitAllHandlers() from your wxApp::OnInit function,
and then call @c wxXmlResource::Get()->Load("myfile.xrc") to load the resource file;
@li to create a dialog from a resource, create it using the default constructor, and then
load it using for example @c wxXmlResource::Get()-LoadDialog(dlg, this, "dlg1");
load it using for example @c wxXmlResource::Get()->LoadDialog(dlg, this, "dlg1");
@li set up event tables as usual but use the @c XRCID(str) macro to translate from XRC string names
to a suitable integer identifier, for example @c EVT_MENU(XRCID("quit"), MyFrame::OnQuit).
to a suitable integer identifier, for example <tt>EVT_MENU(XRCID("quit"), MyFrame::OnQuit)</tt>.
To create an XRC file, you can use one of the following methods.
@li Create the file by hand;
@li use #wxDesigner, a commercial dialog designer/RAD tool;
@li use #DialogBlocks, a commercial dialog editor;
@li use #XRCed, a wxPython-based
dialog editor that you can find in the @c wxPython/tools subdirectory of the wxWidgets
CVS archive;
@li use #wxGlade, a GUI designer written in wxPython. At the moment it can generate Python, C++ and XRC;
@li use wxDesigner (http://www.roebling.de), a commercial dialog designer/RAD tool;
@li use DialogBlocks (http://www.anthemion.co.uk/dialogblocks), a commercial dialog editor;
@li use XRCed (http://xrced.sf.net), a wxPython-based dialog editor that you can find in the
@c wxPython/tools subdirectory of the wxWidgets SVN archive;
@li use wxGlade (http://wxglade.sf.net), a GUI designer written in wxPython.
At the moment it can generate Python, C++ and XRC;
A complete list of third-party tools that write to XRC can be found at
http://www.wxwidgets.org/wiki/index.php/Tools.
A complete list of third-party tools that write to XRC can be found at #www.wxwidgets.org/lnk_tool.htm.
It is highly recommended that you use a resource editing tool, since it's fiddly writing
XRC files by hand.
It is highly recommended that you use a resource editing tool, since it's fiddly
writing XRC files by hand.
You can use wxXmlResource::Load in a number of ways.
You can pass an XRC file (XML-based text resource file)
or a @ref binaryresourcefiles_overview (extension ZIP or XRS) containing other XRC.
You can pass an XRC file (XML-based text resource file) or a zip-compressed file
(see @ref overview_xrc_binaryresourcefiles), with extension ZIP or XRS, containing
other XRC.
You can also use @ref embeddedresource_overview
You can also use embedded C++ resources (see @ref overview_xrc_embeddedresource).
@section overview_binaryresourcefiles Using binary resource files
To compile binary resource files, use the command-line wxrc utility. It takes one or more file parameters
(the input XRC files) and the following switches and options:
@section overview_xrc_binaryresourcefiles Using binary resource files
To compile binary resource files, use the command-line @c wxrc utility.
It takes one or more file parameters (the input XRC files) and the following
switches and options:
@li -h (--help): show a help message
@li -v (--verbose): show verbose logging information
@li -c (--cpp-code): write C++ source rather than a XRS file
@li -e (--extra-cpp-code): if used together with -c, generates C++ header file
containing class definitions for the windows defined by the XRC file (see special subsection)
containing class definitions for the windows defined by the XRC file
(see special subsection)
@li -u (--uncompressed): do not compress XML files (C++ only)
@li -g (--gettext): output underscore-wrapped strings that poEdit or gettext can scan. Outputs to stdout, or a file if -o is used
@li -g (--gettext): output underscore-wrapped strings that poEdit or gettext can scan.
Outputs to stdout, or a file if -o is used
@li -n (--function) name: specify C++ function name (use with -c)
@li -o (--output) filename: specify the output file, such as resource.xrs or resource.cpp
@li -l (--list-of-handlers) filename: output a list of necessary handlers to this file
For example:
@code
@@ -110,6 +119,7 @@
it with standard ZIP tools. Note that if you are using XRS files, you have
to initialize the #wxFileSystem archive handler first! It is a simple
thing to do:
@code
#include wx/filesys.h
#include wx/fs_arc.h
@@ -118,7 +128,7 @@
@endcode
@section overview_embeddedresource Using embedded resources
@section overview_xrc_embeddedresource Using embedded resources
It is sometimes useful to embed resources in the executable itself instead
of loading an external file (e.g. when your app is small and consists only of one
@@ -139,7 +149,7 @@
@endcode
@section overview_xrccppsample XRC C++ sample
@section overview_xrc_cppsample XRC C++ sample
This is the C++ source file (xrcdemo.cpp) for the XRC sample.
@@ -209,13 +219,13 @@
bool MyApp::OnInit()
{
wxImage::AddHandler(new wxGIFHandler);
wxXmlResource::Get()-InitAllHandlers();
wxXmlResource::Get()-Load("rc/resource.xrc");
wxXmlResource::Get()->InitAllHandlers();
wxXmlResource::Get()->Load("rc/resource.xrc");
MyFrame *frame = new MyFrame("XML resources demo",
wxPoint(50, 50), wxSize(450, 340));
frame-Show(@true);
return @true;
frame->Show(true);
return true;
}
// ----------------------------------------------------------------------------
@@ -224,19 +234,19 @@
// frame constructor
MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
: wxFrame((wxFrame *)@NULL, -1, title, pos, size)
: wxFrame((wxFrame *)NULL, -1, title, pos, size)
{
SetIcon(wxICON(appicon));
SetMenuBar(wxXmlResource::Get()-LoadMenuBar("mainmenu"));
SetToolBar(wxXmlResource::Get()-LoadToolBar(this, "toolbar"));
SetMenuBar(wxXmlResource::Get()->LoadMenuBar("mainmenu"));
SetToolBar(wxXmlResource::Get()->LoadToolBar(this, "toolbar"));
}
// event handlers
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
// @true is to force the frame to close
Close(@true);
// true is to force the frame to close
Close(true);
}
void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
@@ -251,187 +261,188 @@
void MyFrame::OnDlg1(wxCommandEvent& WXUNUSED(event))
{
wxDialog dlg;
wxXmlResource::Get()-LoadDialog(, this, "dlg1");
wxXmlResource::Get()->LoadDialog(&dlg, this, "dlg1");
dlg.ShowModal();
}
void MyFrame::OnDlg2(wxCommandEvent& WXUNUSED(event))
{
wxDialog dlg;
wxXmlResource::Get()-LoadDialog(, this, "dlg2");
wxXmlResource::Get()->LoadDialog(&dlg, this, "dlg2");
dlg.ShowModal();
}
@endcode
@section overview_xrcsample XRC resource file sample
@section overview_xrc_sample XRC resource file sample
This is the XML file (resource.xrc) for the XRC sample.
@code
?xml version="1.0"?
resource version="2.3.0.1"
object class="wxMenuBar" name="mainmenu"
stylewxMB_DOCKABLE/style
object class="wxMenu" name="menu_file"
label_File/label
stylewxMENU_TEAROFF/style
object class="wxMenuItem" name="menu_about"
label_About.../label
bitmapfilesave.gif/bitmap
/object
object class="separator"/
object class="wxMenuItem" name="menu_dlg1"
labelDialog 1/label
/object
object class="wxMenuItem" name="menu_dlg2"
labelDialog 2/label
/object
object class="separator"/
object class="wxMenuItem" name="menu_quit"
labelE_xit\tAlt-X/label
/object
/object
/object
object class="wxToolBar" name="toolbar"
stylewxTB_FLAT|wxTB_DOCKABLE/style
margins2,2/margins
object class="tool" name="menu_open"
bitmapfileopen.gif/bitmap
tooltipOpen catalog/tooltip
/object
object class="tool" name="menu_save"
bitmapfilesave.gif/bitmap
tooltipSave catalog/tooltip
/object
object class="tool" name="menu_update"
bitmapupdate.gif/bitmap
tooltipUpdate catalog - synchronize it with sources/tooltip
/object
separator/
object class="tool" name="menu_quotes"
bitmapquotes.gif/bitmap
toggle1/toggle
tooltipDisplay quotes around the string?/tooltip
/object
object class="separator"/
object class="tool" name="menu_fuzzy"
bitmapfuzzy.gif/bitmap
tooltipToggled if selected string is fuzzy translation/tooltip
toggle1/toggle
/object
/object
object class="wxDialog" name="dlg1"
object class="wxBoxSizer"
object class="sizeritem"
object class="wxBitmapButton"
bitmapfuzzy.gif/bitmap
focusfileopen.gif/focus
/object
/object
object class="sizeritem"
object class="wxPanel"
object class="wxStaticText"
labelfdgdfgdfgdfg/label
/object
stylewxBORDER\_SUNKEN/style
/object
flagwxALIGN_CENTER/flag
/object
object class="sizeritem"
object class="wxButton"
labelButtonek/label
/object
border10d/border
flagwxALL/flag
/object
object class="sizeritem"
object class="wxHtmlWindow"
htmlcodeh1Hi,/h1man/htmlcode
size100,45d/size
/object
/object
object class="sizeritem"
object class="wxNotebook"
object class="notebookpage"
object class="wxPanel"
object class="wxBoxSizer"
object class="sizeritem"
object class="wxHtmlWindow"
htmlcodeHello, we are inside a uNOTEBOOK/u.../htmlcode
size50,50d/size
/object
option1/option
/object
/object
/object
labelPage/label
/object
object class="notebookpage"
object class="wxPanel"
object class="wxBoxSizer"
object class="sizeritem"
object class="wxHtmlWindow"
htmlcodeHello, we are inside a uNOTEBOOK/u.../htmlcode
size50,50d/size
/object
/object
/object
/object
labelPage 2/label
/object
usenotebooksizer1/usenotebooksizer
/object
flagwxEXPAND/flag
/object
orientwxVERTICAL/orient
/object
/object
object class="wxDialog" name="dlg2"
object class="wxBoxSizer"
orientwxVERTICAL/orient
object class="sizeritem" name="dfgdfg"
object class="wxTextCtrl"
size200,200d/size
stylewxTE_MULTILINE|wxBORDER_SUNKEN/style
valueHello, this is an ordinary multiline\n textctrl..../value
/object
option1/option
flagwxEXPAND|wxALL/flag
border10/border
/object
object class="sizeritem"
object class="wxBoxSizer"
object class="sizeritem"
object class="wxButton" name="wxID_OK"
labelOk/label
default1/default
/object
/object
object class="sizeritem"
object class="wxButton" name="wxID_CANCEL"
labelCancel/label
/object
border10/border
flagwxLEFT/flag
/object
/object
flagwxLEFT|wxRIGHT|wxBOTTOM|wxALIGN_RIGHT/flag
border10/border
/object
/object
titleSecond testing dialog/title
/object
/resource
<?xml version="1.0"?>
<resource version="2.3.0.1">
<object class="wxMenuBar" name="mainmenu">
<style>wxMB_DOCKABLE</style>
<object class="wxMenu" name="menu_file">
<label>_File</label>
<style>wxMENU_TEAROFF</style>
<object class="wxMenuItem" name="menu_about">
<label>_About...</label>
<bitmap>filesave.gif</bitmap>
</object>
<object class="separator"/>
<object class="wxMenuItem" name="menu_dlg1">
<label>Dialog 1</label>
</object>
<object class="wxMenuItem" name="menu_dlg2">
<label>Dialog 2</label>
</object>
<object class="separator"/>
<object class="wxMenuItem" name="menu_quit">
<label>E_xit\tAlt-X</label>
</object>
</object>
</object>
<object class="wxToolBar" name="toolbar">
<style>wxTB_FLAT|wxTB_DOCKABLE</style>
<margins>2,2</margins>
<object class="tool" name="menu_open">
<bitmap>fileopen.gif</bitmap>
<tooltip>Open catalog</tooltip>
</object>
<object class="tool" name="menu_save">
<bitmap>filesave.gif</bitmap>
<tooltip>Save catalog</tooltip>
</object>
<object class="tool" name="menu_update">
<bitmap>update.gif</bitmap>
<tooltip>Update catalog - synchronize it with sources</tooltip>
</object>
<separator/>
<object class="tool" name="menu_quotes">
<bitmap>quotes.gif</bitmap>
<toggle>1</toggle>
<tooltip>Display quotes around the string?</tooltip>
</object>
<object class="separator"/>
<object class="tool" name="menu_fuzzy">
<bitmap>fuzzy.gif</bitmap>
<tooltip>Toggled if selected string is fuzzy translation</tooltip>
<toggle>1</toggle>
</object>
</object>
<object class="wxDialog" name="dlg1">
<object class="wxBoxSizer">
<object class="sizeritem">
<object class="wxBitmapButton">
<bitmap>fuzzy.gif</bitmap>
<focus>fileopen.gif</focus>
</object>
</object>
<object class="sizeritem">
<object class="wxPanel">
<object class="wxStaticText">
<label>fdgdfgdfgdfg</label>
</object>
<style>wxBORDER\_SUNKEN</style>
</object>
<flag>wxALIGN_CENTER</flag>
</object>
<object class="sizeritem">
<object class="wxButton">
<label>Buttonek</label>
</object>
<border>10d</border>
<flag>wxALL</flag>
</object>
<object class="sizeritem">
<object class="wxHtmlWindow">
<htmlcode>&lt;h1&gt;Hi,&lt;/h1&gt;man</htmlcode>
<size>100,45d</size>
</object>
</object>
<object class="sizeritem">
<object class="wxNotebook">
<object class="notebookpage">
<object class="wxPanel">
<object class="wxBoxSizer">
<object class="sizeritem">
<object class="wxHtmlWindow">
<htmlcode>Hello, we are inside a &lt;u&gt;NOTEBOOK&lt;/u&gt;...</htmlcode>
<size>50,50d</size>
</object>
<option>1</option>
</object>
</object>
</object>
<label>Page</label>
</object>
<object class="notebookpage">
<object class="wxPanel">
<object class="wxBoxSizer">
<object class="sizeritem">
<object class="wxHtmlWindow">
<htmlcode>Hello, we are inside a &lt;u&gt;NOTEBOOK&lt;/u&gt;...</htmlcode>
<size>50,50d</size>
</object>
</object>
</object>
</object>
<label>Page 2</label>
</object>
<usenotebooksizer>1</usenotebooksizer>
</object>
<flag>wxEXPAND</flag>
</object>
<orient>wxVERTICAL</orient>
</object>
</object>
<object class="wxDialog" name="dlg2">
<object class="wxBoxSizer">
<orient>wxVERTICAL</orient>
<object class="sizeritem" name="dfgdfg">
<object class="wxTextCtrl">
<size>200,200d</size>
<style>wxTE_MULTILINE|wxBORDER_SUNKEN</style>
<value>Hello, this is an ordinary multiline\n textctrl....</value>
</object>
<option>1</option>
<flag>wxEXPAND|wxALL</flag>
<border>10</border>
</object>
<object class="sizeritem">
<object class="wxBoxSizer">
<object class="sizeritem">
<object class="wxButton" name="wxID_OK">
<label>Ok</label>
<default>1</default>
</object>
</object>
<object class="sizeritem">
<object class="wxButton" name="wxID_CANCEL">
<label>Cancel</label>
</object>
<border>10</border>
<flag>wxLEFT</flag>
</object>
</object>
<flag>wxLEFT|wxRIGHT|wxBOTTOM|wxALIGN_RIGHT</flag>
<border>10</border>
</object>
</object>
<title>Second testing dialog</title>
</object>
</resource>
@endcode
@section overview_xrcfileformat XRC file format
@section overview_xrc_fileformat XRC file format
Please see Technical Note 14 (docs/tech/tn0014.txt) in your wxWidgets
distribution.
@section overview_xrccppheader C++ header file generation
@section overview_xrc_cppheader C++ header file generation
Using the @c -e switch together with @c -c, a C++ header file is written
containing class definitions for the GUI windows defined in the XRC file.
@@ -446,31 +457,34 @@
all XRC loading is done and all class members representing widgets are initialized.
A simple example will help understand how the scheme works. Suppose you have
a XRC file defining a top level window @c TestWnd_Base, which subclasses @c wxFrame (any
other class like @c wxDialog will do also), and has subwidgets @c wxTextCtrl A and @c wxButton B.
The XRC file and corresponding class definition in the header file will be something like:
a XRC file defining a top level window @c TestWnd_Base, which subclasses @c wxFrame
(any other class like @c wxDialog will do also), and has subwidgets @c wxTextCtrl A
and @c wxButton B.
The XRC file and corresponding class definition in the header file will
be something like:
@code
?xml version="1.0"?
resource version="2.3.0.1"
object class="wxFrame" name="TestWnd_Base"
size-1,-1/size
titleTest/title
object class="wxBoxSizer"
orientwxHORIZONTAL/orient
object class="sizeritem"
object class="wxTextCtrl" name="A"
labelTest label/label
/object
/object
object class="sizeritem"
object class="wxButton" name="B"
labelTest button/label
/object
/object
/object
/object
/resource
<?xml version="1.0"?>
<resource version="2.3.0.1">
<object class="wxFrame" name="TestWnd_Base">
<size>-1,-1</size>
<title>Test</title>
<object class="wxBoxSizer">
<orient>wxHORIZONTAL</orient>
<object class="sizeritem">
<object class="wxTextCtrl" name="A">
<label>Test label</label>
</object>
</object>
<object class="sizeritem">
<object class="wxButton" name="B">
<label>Test button</label>
</object>
</object>
</object>
</object>
</resource>
class TestWnd_Base : public wxFrame {
@@ -480,7 +494,7 @@
private:
void InitWidgetsFromXRC(){
wxXmlResource::Get()-LoadObject(this,@NULL,"TestWnd","wxFrame");
wxXmlResource::Get()->LoadObject(this,NULL,"TestWnd","wxFrame");
A = XRCCTRL(*this,"A",wxTextCtrl);
B = XRCCTRL(*this,"B",wxButton);
}
@@ -493,9 +507,10 @@
The generated window class can be used as basis for the full window class. The
class members which represent widgets may be accessed by name instead of using
@c XRCCTRL every time you wish to reference them (note that they are @c protected class members),
though you must still use @c XRCID to refer to widget IDs in the event
table.
@c XRCCTRL every time you wish to reference them (note that they are @c protected
class members), though you must still use @c XRCID to refer to widget IDs in the
event table.
Example:
@code
@@ -505,8 +520,8 @@
public:
TestWnd(){
// A, B already initialised at this point
A-SetValue("Updated in TestWnd::TestWnd");
B-SetValue("Nice :)");
A->SetValue("Updated in TestWnd::TestWnd");
B->SetValue("Nice :)");
}
void OnBPressed(wxEvent& event){
Close();
@@ -520,13 +535,14 @@
@endcode
It is also possible to access the wxSizerItem of a sizer that is part of
a resource. This can be done using @c XRCSIZERITEM as shown. The
resource file can have something like this for a sizer item.
a resource. This can be done using @c XRCSIZERITEM as shown.
The resource file can have something like this for a sizer item.
@code
object class="spacer" name="area"
size400, 300/size
/object
<object class="spacer" name="area">
<size>400, 300</size>
</object>
@endcode
The code can then access the sizer item by using @c XRCSIZERITEM and
@@ -537,11 +553,12 @@
@endcode
@section overview_newresourcehandlers Adding new resource handlers
@section overview_xrc_newresourcehandlers Adding new resource handlers
Adding a new resource handler is pretty easy.
Typically, to add an handler for the @c MyControl class, you'll want to create
the @c xh_mycontrol.h @c xh_mycontrol.cpp files.
the @c xh_mycontrol.h and @c xh_mycontrol.cpp files.
The header needs to contains the @c MyControlXmlHandler class definition:
@@ -604,21 +621,21 @@
//
// then the XRC for your component should look like:
//
// object class="MyControl" name="some_name"
// first-bitmapfirst.xpm/first-bitmap
// second-bitmaptext.xpm/second-bitmap
// first-pos3,3/first-pos
// second-pos4,4/second-pos
// the-titlea title/the-title
// title-font
// !-- the standard XRC tags for describing a font: size, style, weight, etc --
// /title-font
// !-- XRC also accepts other usual tags for wxWindow-derived classes:
// like e.g. name, style, size, position, etc --
// /object
// <object class="MyControl" name="some_name">
// <first-bitmap>first.xpm</first-bitmap>
// <second-bitmap>text.xpm</second-bitmap>
// <first-pos>3,3</first-pos>
// <second-pos>4,4</second-pos>
// <the-title>a title</the-title>
// <title-font>
// <!-- the standard XRC tags for describing a font: <size>, <style>, <weight>, etc -->
// </title-font>
// <!-- XRC also accepts other usual tags for wxWindow-derived classes:
// like e.g. <name>, <style>, <size>, <position>, etc -->
// </object>
//
// and the code to read your custom tags from the XRC file is just:
control-Create(m_parentAsWindow, GetID(),
control->Create(m_parentAsWindow, GetID(),
GetBitmap(wxT("first-bitmap")),
GetPosition(wxT("first-pos")),
GetBitmap(wxT("second-bitmap")),
@@ -641,9 +658,8 @@
@endcode
You may want to check the #wxXmlResourceHandler documentation
to see how many built-in getters it contains. It's very easy to retrieve also complex structures
out of XRC files using them.
to see how many built-in getters it contains. It's very easy to retrieve also
complex structures out of XRC files using them.
*/