Attribute: increment

The increment attribute, when added to the sys:xform-user-update tag, allows you to specify a particular increment to increase or decrease the selected field's current value by every time that a user visits the page in question.

A plus or minus sign should be entered alongside the desired increment in order to indicate which direction you would like the field's current value to be changed in each time the user visits the page.

Simply enter the tag into the desired page's "Source" editor window, along with the attribute and desired increment, and the outcome should look something like this:

<sys:xform-user-update increment="+1" />

Note: This attribute is mutually exclusive with the value attribute. You can only use one or the other in a single tag.