Define page break on Layflat spreads

When working with layflat albums, you can define a middle page break by nesting the below code within the page. This is not only useful for the visual element of seeing a line to define where the fold will be, but it also activates the horizontal center snapping for the alignment aides.

<filter type="binding-layflat" />

See below example below for a set:

<set grow="true">
    <captions>
        <left>Page {{n}}</left> <right>Page {{n}}</right>
    </captions>  
    <page type="spread01, spread02, spread03" position="left-right" bleed="3" margin="3" width="606" height="306">
        <filter type="binding-layflat" />
    </page>
</set>