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Section A - DDX User Guide > Adding and Manipulating Page Content > Understanding rendering order
Understanding rendering order
When a PageContent, PageOverlay, or PageUnderlay element is added to page content in a PDF result block, it should not be regarded as containing the PageContent, PageOverlay, or PageUnderlay, since it is no longer separable from the other page content and cannot be removed by other DDX elements from the saved PDF.
The order of appearance can be affected by the fact that watermarks and backgrounds can be added and removed, as well as the fact that the order within one PDF result block is set by the Assembler service, not by the order specified within the result block.
When adding a new PageContent, PageOverlay, Watermark, Background or PageUnderlay in one result block, there is a relationship between the PageContent (appears="OnTop"), PageOverlay and Watermark since all are page content added over existing page content. There is a similar relationship between PageContent (appears="Behind"), Background and PageUnderlay since they are page content added behind existing page content.
The order is fixed by the Assembler service when specifying a PageContent, PageOverlay, and Watermark in the same result block. The Watermark is applied first followed by the PageContent and finally by the PageOverlay, so that the PageOverlay will appear on top of the PageContent, which will appear on top of the Watermark.
Similarly, the order is fixed by the Assembler service when specifying a PageContent, PageUnderlay and (or) Background in the same result block. The Background is applied first followed by the PageContent and finally by the PageUnderlay, so that the PageUnderlay will appear behind or underneath the PageContent, which will appear behind the Background.
In some cases you may want to add a Watermark over a PageOverlay, or add a Background under a PageUnderlay. You cannot accomplish this order within one result block, since the order is fixed. However, you can accomplish this by first applying the PageOverlay or PageUnderlay and either saving it or using it as transient data, and then applying the Watermark or Background.
Section A - DDX User Guide > Adding and Manipulating Page Content > Understanding rendering order

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