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Developing Applications Using APIs > Assembling PDF Documents > Understanding DDX > DDX building blocks

DDX building blocks
The primary function of the Assembler service is to assemble multiple PDF documents into a single document.
The Assembler service can also generate output of types other than PDF. These other types represent either components of PDF documents, such as bookmarks, or information related to PDF documents.
You use DDX elements to specify everything about the document or documents you want the Assembler service to generate.
DDX elements can be grouped according to the following categories. Each category represents a building block of a PDF or other file type. The names of DDX elements reflect their content type. (See the Document Description XML Reference for a complete list of elements):
Document assembly elements represent PDF documents or pages from existing PDF documents (the PDF element). In addition, the TableOfContents and BlankPage elements specify new pages to be added to an assembly.
Document disassembly elements (PDFsFromBookmarks) create multiple PDF documents from a single document.
Document component elements represent parts of PDF documents that can be imported and exported but are not pages or page content; for example, Bookmarks and Links.
Document property elements represent information associated with a document, such as Metadata and InitialViewProfile.
Page content elements specify new content that is added to pages in PDF documents, such as Header and Watermark elements.
Page property elements specify how pages are viewed or printed, for example, the PageSize element.
Page label elements (PageLabel) specify page identifiers that are used for navigation in viewer applications and can also be added as content to the page by the Assembler service.
Query elements specify XML documents containing specific types of information about PDF documents. They include elements such as DocumentInformation and DocumentText.
These elements and their usage are described in detail throughout this document.

 

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