This function returns a non-zero value if the stylesheet associated with doc can be modified using Arbortext Styler. This non-zero value indicates the Arbortext Styler version that the stylesheet was created by, or has been updated for use by. Updating from one Arbortext Styler version to the next happens automatically. If the stylesheet cannot be modified using Arbortext Styler, the function returns 0.

This function uses the stylesheet for the current document if no document is specified.