The PDF Standards category contains checks and fixes that are specific to one of the PDF/X or PDF/A standards. However, there are more criteria a PDF document should meet to comply with a PDF/X or PDF/A standard. These criteria are checks that you can find in the other categories of the Enfocus Preflight Profile Editor. Examples are the PDF version, which can be checked in the Document category, or the use of transparency (in the Transparency category).
To make it easier to verify PDF/X and PDF/A compliance, the Enfocus Preflight Profile Editor has two special checks called PDF/X Compliancy and PDF/A Compliancy (see below). You can use these checks to verify whether all the relevant properties of the PDF document comply with the selected PDF/X or PDF/A standard. You can also select the corresponding fixes, all collected in one single dialog.
Note that it is not possible to restrict the checks in this category, because the all-in-one checks (such as PDF/X compatibility) apply to the whole document and cannot be limited to a particular selection.