Hello, 
 
During the work on the custom slide show feature in kpresenter I think I found 
a problem in the opendocument spec. 
 
Background: 
 
In 9.1.4 Drawing Pages there is defined that a page name can be set by using  
the draw:name attribute. It also says that if it is used it has to be unique.  
Also there is a unique draw:id attribute for a page. 
 
Problem in OOo-impress: 
If you name Slide 1 "page1" and you save and reload the document it will say  
"Slide 1" as name for the slide. This is because OOo-impress uses pageX as  
the default when none is there. 
 
With this it is also possible to trick OOo-impress to generate 2 times 
draw:name="page3" if you set no name for slide 3 and set the name for slide 2 
to page3.  
If you do so the custom slide show feature will no longer work as expected. 
 
To solve the problem of having such problems in the first place I think the  
OpenDocument spec should be changed to use draw:id to identify the different  
pages instead of the draw:name as the draw:name can changed by user input.  
Also the draw:name should not have to be unique.