The.opf file extension can be classified into a variety of file types. First, it can be an Open Packaging Format File or files formatted with the standard set by Open Packaging. Files with the.opf extension are more of e-book files as they mostly contain information about the e-book from the title to the author as well as other information. How to open a OPF file: The best way to open an OPF data file is to simply double-click it and let the default assoisated application open the file. If you are unable to open the file this way, it may be because you do not have the correct application associated with the extension to view or edit the OPF file. These opf files do not need to be copied. These are created automatically by calibre as a way of backing up your existing library's metadata.db file in the event of catastrophic loss or damage to the file. If the file is damaged there is a restore feature that utilizes th. Personnel files contain employment records maintained by an employer for the purpose of administering benefits, providing training, and maintaining the employment history of employees for continued employment and/or promotional opportunities. What is an Official Personnel Folder (OPF)? The Official Personnel Folder (Standard Form 66) is a file containing records for an individual’s federal employment career. Employees with OPFs are those in the Executive Branch service, as listed in Title V of the United States Code and some federal employees not under Title V.
OPF is the open packaging format that is defined by idpf.
[edit]Overview
The Open Package format has a long history with the <idpf>. It is used in all three versions of the specification. It always contains the metadata that describes such things as the title, author name, etc. In Version 1 some use it as an alternate name for the standard which was officially called Open eBook. MOBI, LIT, and IMP all use a version 1 OPF (.opf) in their source.
All three versions have an entry called package which looks something like:
Version one does not contain the version number but version 2 and version 3 must be identified in the opening entry.
Both Version 2 and version 3 use it as the internal file metadata used in ePub. In ePub 3 the OPF portion is now called the Publications standard. It is basically the same as OPF version 2.01 with a few additions.
[edit]Structure
The OPF file can be located anywhere in the ePub file structure and can be named whatever you wish. In ePub there is a folder called META-INF that must always be present. Inside there must be a file call container.xml. The content of that container file points to the OPF file. It might look like:
[edit]Specification
The Open Packaging Format (OPF) Specification, defines the mechanism by which the various components of an OPS publication are tied together and provides additional structure and semantics to the electronic publication.
Specifically, OPF:
Of Files And Managing Metadata
- Describes and references all components of the electronic publication (e.g. markup files, images, navigation structures).
- Provides publication-level metadata. Specifically it should include Dublin Core formatted data with information about the eBook such as author and title.
- Provides a unique identification number. This is usually the ISBN if available.
- Specifies the linear reading-order of the publication.
- Provides fallback information to use when unsupported extensions to OPS are employed.
- Provides a mechanism to specify a declarative table of contents (the NCX).
- May provide pointers to additional optional elements such as embedded fonts.
Version 3 can contain version 2 data for backward compatibility but a version 3 reader will ignore all data not supported in version 3.
[edit]Example version 2
See ePub OPF section for one example. For an example of Version 1.2 see Open eBook Package File.Here is another 2.01 example:
[edit]Example version 3
[edit]MIME Media types
In the samples above there are examples of the Media types supported in ePub. Here is the complete list of required items to support.
| MIME Media Type | Reference | Description |
|---|---|---|
| image/gif | http://www.w3.org/Graphics/GIF/spec-gif89a.txt | Used for raster graphics (GIF) |
| image/jpeg | http://www.w3.org/Graphics/JPEG/ | Used for raster graphics (JPG) |
| image/png | RFC 2083 | Used for raster graphics (PNG) |
| image/svg+xml | http://www.w3.org/TR/SVG11/ | Used for vector graphics (SVG) |
| application/xhtml+xml | XHTML 1.1 | Used for OPS Content Documents |
| application/x-dtbook+xml | http://www.niso.org/standards/resources/Z39-86-2005.html | Used for OPS Content Documents |
| text/css | CSS 2.0 | Used for OPS CSS-subset style sheets |
| application/xml | http://www.w3.org/TR/xml11/ | Used for Out-Of-Line XML Islands |
| text/x-oeb1-document | OEBPS 1.2 specification | Deprecated; Used for Basic or Extended OEBPS 1.0.1 and 1.2 Documents |
| text/x-oeb1-css | OEBPS 1.2 specification | Deprecated; Used for OEBPS 1.0.1 and 1.2 CSS-subset style sheets |
| application/x-dtbncx+xml | DTBook specification | The NCX |
Opf Files To Epub
[edit]Mobi specific
Mobi and the newer Kindle AZW and KF8 formats need special entries in the OPF for the TOC and Cover. You need to add the 'TOC' entry in the GUIDE section of the OPF in order for the TOC option to be made available.
Eopf Army Civilian Log In
The OPF file can be used to create an eBook using MobiPocket Creator or KindleGen simply by using it as the starting point for the compiler. It will find the other files necessary by parsing this file. Note the 'Start here' entry may also use type='text'
[edit]Unique id
The web site http://www.famkruithof.net/uuid/uuidgen can provide a unique id for an eBook as needed in the OPF.