If you download the latest version of Adobe Acrobat Reader, it will tell you if your pdf is PDF/A compliant. Just open the PDF file and a big blue marking should appear.
OpenOffice supports PDF/A.
For some reason "PDF/A-1" is called
"SelectPdfVersion"
internally in OpenOffice.
Just add 1 to that value and your output should be PDF/A.
The different values can be
0 = PDFXNONE
1 = PDFX1A2001
2 = PDFX32002
3 = PDFA1A
4 = PDFA1B
You set
FilterData
to be a
HashMap('SelectPdfVersion',1) //1 for PDFX1A2001