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In addition, XFDF does not allow the spawning, or addition, of new pages based on the given data; as can be done when using an FDF encyclopedia 2015 pdf form. It encyclopedia 2015 pdf form also be used to export form data to stand-alone files that can be imported back into the corresponding PDF interactive form.

Logical structure and accessibility[ edit ] A "tagged" PDF see clause Technically speaking, tagged PDF is a stylized use of the format that builds on the logical structure framework introduced in PDF 1.

Tagged PDF defines a set of standard structure types and attributes that allow page content text, graphics, and images to be extracted and reused for other purposes.

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Layers, or as encyclopedia 2015 pdf form are more formally known Optional Content Groups OCGsrefer to sections of content in a PDF document that can be selectively viewed or hidden by document authors or consumers. This capability is useful in CAD drawings, layered artwork, maps, multi-language documents etc.

Basically, it consists of an Encyclopedia 2015 pdf form Content Properties Dictionary added to the document root. This dictionary contains an array of Optional Content Groups OCGseach describing a set of information and each of which may be individually displayed or suppressed, plus a set of Optional Content Configuration Dictionaries, which give the status Displayed or Suppressed of the given OCGs.

Security and signatures[ edit ] A PDF file may be encrypted for security, or digitally signed for authentication.

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The user password encrypts the file, while the owner password does not, instead relying on client software to respect these restrictions. An owner password can easily be removed by software, including some free online services.

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Even encyclopedia 2015 pdf form removing the password, most encyclopedia 2015 pdf form or open source PDF readers ignore the permission "protections" and allow the user to print or make copy of excerpts of the text as if the document were not limited by password protection.

Not only can they restrict document access but they also reliably enforce permissions in ways that the standard security handler does not. The signature is used to validate that the permissions have been granted by a bona fide granting authority.

For example, encyclopedia 2015 pdf form can be used to allow a user: Adobe Reader verifies that the signature uses a certificate from an Adobe-authorized certificate authority. Any PDF application can use this same mechanism for its own purposes.

Metadata[ edit ] PDF files can contain two types of metadata.

This is stored in the optional Info trailer of the file. A small set of fields is defined, and can be extended with additional text values if required. This method is deprecated in PDF 2.

This allows metadata to be attached to any stream in the document, such as information about embedded illustrations, as well as the whole document attaching to the document catalogusing an extensible encyclopedia 2015 pdf form.

Usage restrictions and monitoring[ edit ] PDFs may be encrypted so that encyclopedia 2015 pdf form password is needed to view or edit the contents. PDF files may also contain embedded DRM restrictions that provide further controls that limit copying, editing or printing.

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Works vary in the breadth encyclopedia 2015 pdf form material and the depth of discussion, depending on the target audience. Some systematic method of organization is essential to making an encyclopedia usable for reference.

There have historically been two main methods of organizing printed encyclopedias: