Generate XFDF data for use in filling a PDF form, with XQuery; see http://joewiz.org/2014/02/13/filling-pdf-forms-with-pdftk-xfdf-and-xquery/

generate-xfdf.xq

xquery version "3.0";

import module namespace functx="http://www.functx.com";

(: Prepare XFDF data to use with PDFtk to populate a blank form SF702, 
   e.g., http://www.archives.gov/isoo/security-forms/sf702.pdf,
   with data for each month of the year :)

let $data-collection := xmldb:create-collection('/db', 'sf702')
let $year := 2014
let $months := (1 to 12) ! functx:pad-integer-to-length(., 2)
return
    for $month in $months
    let $first-day := xs:date(string-join(($year, $month, '01'), '-'))
    let $days := (1 to functx:days-in-month($first-day)) ! functx:pad-integer-to-length(., 2)
    let $month-year := $month || '/' || substring($year, 3, 2)
    let $xfdf :=
        <xfdf xmlns="http://ns.adobe.com/xfdf/">
            <fields>
                <field name="form1[0].#subform[0].MONTHYEAR[0]">
                    <value>{$month-year}</value>
                </field>
                <field name="form1[0].#subform[0].MONTHYEAR2[0]">
                    <value>{$month-year}</value>
                </field>
                { 
                for $day at $n in $days 
                let $field-name :=
                    if ($n le 22) then 
                        'form1[0].#subform[0].Date' || $n || '[0]'
                    else 
                        'form1[0].#subform[0].Date' || $n - 22 || '[1]'
                return
                    <field name="{$field-name}">
                        <value>{$day}</value>
                    </field>
                }
            </fields>
        </xfdf>
    let $filename := string-join(('sf702', $year, $month), '-') ||  '.xml'
    return
        xmldb:store($data-collection, $filename, $xfdf)

generate-xfdf_sample-result.xml

<xfdf xmlns="http://ns.adobe.com/xfdf/">
    <fields>
        <field name="form1[0].#subform[0].MONTHYEAR[0]">
            <value>01/14</value>
        </field>
        <field name="form1[0].#subform[0].MONTHYEAR2[0]">
            <value>01/14</value>
        </field>
        <field name="form1[0].#subform[0].Date1[0]">
            <value>01</value>
        </field>
        <field name="form1[0].#subform[0].Date2[0]">
            <value>02</value>
        </field>
        <field name="form1[0].#subform[0].Date3[0]">
            <value>03</value>
        </field>
        <field name="form1[0].#subform[0].Date4[0]">
            <value>04</value>
        </field>
        <field name="form1[0].#subform[0].Date5[0]">
            <value>05</value>
        </field>
        <field name="form1[0].#subform[0].Date6[0]">
            <value>06</value>
        </field>
        <field name="form1[0].#subform[0].Date7[0]">
            <value>07</value>
        </field>
        <field name="form1[0].#subform[0].Date8[0]">
            <value>08</value>
        </field>
        <field name="form1[0].#subform[0].Date9[0]">
            <value>09</value>
        </field>
        <field name="form1[0].#subform[0].Date10[0]">
            <value>10</value>
        </field>
        <field name="form1[0].#subform[0].Date11[0]">
            <value>11</value>
        </field>
        <field name="form1[0].#subform[0].Date12[0]">
            <value>12</value>
        </field>
        <field name="form1[0].#subform[0].Date13[0]">
            <value>13</value>
        </field>
        <field name="form1[0].#subform[0].Date14[0]">
            <value>14</value>
        </field>
        <field name="form1[0].#subform[0].Date15[0]">
            <value>15</value>
        </field>
        <field name="form1[0].#subform[0].Date16[0]">
            <value>16</value>
        </field>
        <field name="form1[0].#subform[0].Date17[0]">
            <value>17</value>
        </field>
        <field name="form1[0].#subform[0].Date18[0]">
            <value>18</value>
        </field>
        <field name="form1[0].#subform[0].Date19[0]">
            <value>19</value>
        </field>
        <field name="form1[0].#subform[0].Date20[0]">
            <value>20</value>
        </field>
        <field name="form1[0].#subform[0].Date21[0]">
            <value>21</value>
        </field>
        <field name="form1[0].#subform[0].Date22[0]">
            <value>22</value>
        </field>
        <field name="form1[0].#subform[0].Date1[1]">
            <value>23</value>
        </field>
        <field name="form1[0].#subform[0].Date2[1]">
            <value>24</value>
        </field>
        <field name="form1[0].#subform[0].Date3[1]">
            <value>25</value>
        </field>
        <field name="form1[0].#subform[0].Date4[1]">
            <value>26</value>
        </field>
        <field name="form1[0].#subform[0].Date5[1]">
            <value>27</value>
        </field>
        <field name="form1[0].#subform[0].Date6[1]">
            <value>28</value>
        </field>
        <field name="form1[0].#subform[0].Date7[1]">
            <value>29</value>
        </field>
        <field name="form1[0].#subform[0].Date8[1]">
            <value>30</value>
        </field>
        <field name="form1[0].#subform[0].Date9[1]">
            <value>31</value>
        </field>
    </fields>
</xfdf>