Sorry, you can't do filtering via AppleScript at this point. (I'll file a feature request for you.) The only properties that work are the ones in the Export Settings.
diagram type -- Export to Graffle diagram type.
iCal todo -- Export to iCal as to-do items instead of calendar events.
include task groups -- Include task groups in CSV export.
show all rows -- Expand all groups for the export.
views to include -- Which views to export (outline, gantt, or both)
diagram type -- Export to Graffle diagram type.
iCal todo -- Export to iCal as to-do items instead of calendar events.
include task groups -- Include task groups in CSV export.
show all rows -- Expand all groups for the export.
views to include -- Which views to export (outline, gantt, or both)
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