Thanks for your help. I've been long to answer because I've made some more testings.

So I'm using a desktop version of inDesign CS4. First, here is a small part of my import function, wich works when called from ESTK. Then I'll try to explain the problems when called from inDesign. It's exactly the same code exept for some paths.

// 1. import XML and move XML content into the inDesign template

myDocument.importXML(File(newXML));

__processRuleSet(myDocument.xmlElements.item(0), [(new displayXML)]);

// 2. Resize graphics at 10% to avoid them being bigger than a text frame, thus creating pages endlessly at the next step

images = myStory.allGraphics;

for (var i = 0; i < images.length; i++) {   

     images[i].parent.horizontalScale = 10;

     images[i].parent.verticalScale = 10;

}

// 3. Smart text reflow

myDocument.textPreferences.smartTextReflow = true;

myDocument.textPreferences.addPages = AddPageOptions.END_OF_STORY;

myDocument.textPreferences.limitToMasterTextFrames = true;

myDocument.textPreferences.preserveFacingPageSpreads = true;

myDocument.textPreferences.deleteEmptyPages = true;

myDocument.recompose();

// 4. Resize the graphics at the size of a text frame. To do so I first take the bounds of the rectangle in wich they are included.

for (var i = 0; i < images.length; i++) {

     var hRectangle = image[i].parent.geometricBounds[2] - graphic.parent.geometricBounds[0];

     // etc.

}

Now this doesn't work at well from inDesign. First, smartTextReflow has no effect, I guess it's because the recompose() method doesn't work. Maybe recompose doesn't exist on the desktop version of inDesign, as said here:

http://forums.adobe.com/thread/889314

Actually, to make it trickier, it's a little bit more random if smartTextReflow works or not. It can depend of other parts of the script, where I link some paragraphs together, making inDesign recomposing the text without the recompose method.

To make it even more trickier, sometimes smartTextReflow works even when there is nothing to force inDesign to recompose the document...

So instead of using recompose() I've written a forceRecompose() function which adds a space at the end of the first paragraph of the document, to force inDesign to recompose and to make smartTextReflow works in any cases.

I can put the code here but it's still a bit rough.

Now I still have the problem of getting the geometricBounds of the graphics, with this message : "Invalid object for this request".

My hypothesis is it's because smartTextReflow starts adding pages when the script stops running. So when the script tries to get the bounds of the graphics, they aren't yet placed on a page so it can't get it.

But when the script is called from ESTK, smartTextReflow and recompose() would make inDesign add the pages while the script is still running, making it possible for the graphics to be resized.

Sorry for these long explanations, I've tried to make it clear.

Anyway, every help to understand better the behavior of inDesign would be appreciated.