Ordinal Identifiers Alone can Make an Object Unique with Real Life Example in QTP

When ordinal identifiers alone can make an object unique with Real Life Example in QTP then why they are not given top priority? 
 

Why it is first mandatory and next assistive. Why we cannot go for ordinal identifiers directly?

What is the file extension of the code file in QTP ?

• When 2 objects overlapped on each other then identification will fail which will be on location based.
• If your script will use only index based identification then your script will work but execution time will be increased too much.

Therefore assistive and mandatory properties can be used.

Three types of properties are used by the QTP during the identification of object, These properties are Ordinal identifiers, Mandatory and Assistive. So here we will discuss about the Ordinal Identifiers properties:

A Real Life Example of Ordinal Identifiers, Mandatory and Assistive Properties:

Ordinal Identifiers Alone can Make an Object Unique

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