> ## Documentation Index
> Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Sample 1. Step 8: Testing the identifier element
> Test the IDHeader identifier element in Sample 1 by matching the FlexiLayout with each batch image and reviewing results in the Tree of Hypotheses.
To check that the program can reliably detect the image object corresponding to the **IDHeader** identifier element, match the FlexiLayout with each image in the batch:
1. Open each image one by one.
2. Select the **Match** command in the **FlexiLayout** menu or in the shortcut menu of each image.
If the image and its FlexiLayout have been matched successfully, the program draws a blue frame around the detected element, and the hypothesis that the program formulates about the **IDHeader** element is marked with 
in the **Tree of Hypotheses**. If you click the hypothesis, the hypothesis properties appear in the **Properties** window.
After you examine the FlexiLayout matching results for all the images, you see that the program fails to formulate a hypothesis for the **IDHeader** element on image 2 (it is marked with 
). This is because the document heading is written in two lines on this image, whereas you described **IDHeader** as single-line text.