There is a difference between the xpath with and and the xpath with 2 separate [ blocks ].
1. The first XPath queries for $Student objects where both the Name equals 'Lokesh' and Age equals 22 simultaneously. It performs a single query operation filtering on both conditions.
2. The second XPath applies two separate filters sequentially: first, it filters $Student objects where the Name equals 'Lokesh', then on that result set, it filters objects where Age equals 22. While logically these may return the same result set as the first XPath in most scenarios, the performance can differ based on the underlying optimization of the Mendix platform.
In general, the first approach might be more efficient because it combines conditions in a single query, potentially minimizing the dataset to be evaluated in one step. However, the actual performance difference would depend on the Mendix model's implementation and the database optimization for handling such queries.