What property would likely need adjustment if you encounter issues with getting data from different structured PDF files?

When dealing with data extraction from different structured PDF files, the selector property is crucial because it defines how the automation framework identifies and interacts with the elements in the document. In the context of PDF files, these files often have various layouts, fonts, and structures depending on their creation method and content.

If the selector property is not accurately defined or adjusted, the automation may struggle to locate specific elements or extract the desired information effectively. This is particularly important when PDFs do not follow a consistent formatting pattern. Tweaking the selector property allows for more precise targeting of the necessary data, ensuring that the automation script can adapt to the variations present in different PDF files.

In contrast, the other properties listed do not relate directly to the identification and retrieval of data within the varied structures of PDF files. For instance, the label property pertains to user interface elements and does not apply to PDF data extraction scenarios, while the range property usually refers to selecting data within a predefined set of criteria and typically does not influence PDF interaction. The source file property, while important, would be more concerned with the input location and format rather than structuring the interaction with individual data points. Hence, adjusting the selector property becomes essential for tackling the challenges posed by different structured PDF files.