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Graphical content in PDF documents can be stored on different layers, which can be displayed or hidden under user control. Such content is also referred to as optional content.Each layer in a PDF document has a name. When assembling two or more PDF documents, you may or may not want to distinguish between the layers that originated from different source documents. To control this, you can use the layerLabel attribute of PDF source elements as well as the mergeLayers attribute of the PDF result element.Layers in a PDF document can be grouped under a label name. You use the layerLabel attribute of a PDF source element to specify the name of a top-level label under which all the layers of the source document are grouped. This enables users of the document to distinguish between layers from different source documents.The mergeLayers attribute of the PDF result document determines whether layers with the same name from different source documents are kept as separate layers in the result document. If mergeLayers is false (the default), layers from source documents are kept distinct in the result document. If mergeLayers is true, layers with the same name are merged into a single layer in the result document.
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