Some SAS^® applications, including FSEDIT applications, require data to be accessed via a random access method. However, the XML LIBNAME engine allows only sequential read data access. Therefore, in FSEDIT, if you attempt to display data that has been allocated via the XML LIBNAME engine, you will see the following behaviors starting in SAS 9.2:

• The data will open in browse mode with FSBROWSE instead of in edit mode with FSEDIT.
• You will be able to scroll forward from the current observation to the next observation.
• If you attempt to scroll backward, you will be taken to observation 0.
• You will be able to scroll forward through the data successfully until you scroll past the last observation, at which time you will be taken to observation 0.

At any time, you can issue the TOP command to reset the data file back to observation 1, and you can continue scrolling down sequentially through each observation.

In SAS 9.2, there are no error messages or warnings written to the SAS log.

Prior to SAS 9.2, you might receive an error like the following when you attempt to scroll backwards or scroll past the last observation in the table:

INTERNAL CODING ERROR <YOPNT>: XO_PREV used for a 2 PASS access pattern on file MYLIB.CLASS.DATA.

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