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| [Audiobook Profile](audiobook.md) | Defines a dedicated profile for audiobooks. | [https//readium.org/webpub-manifest/profiles/audiobook](https//readium.org/webpub-manifest/profiles/audiobook) |
| [Digital Visual Narratives Profile](divina.md) | Defines a dedicated profile for visual narratives (comics, manga and bandes dessinées). | [https//readium.org/webpub-manifest/profiles/divina](https//readium.org/webpub-manifest/profiles/divina) |
| [EPUB Profile](epub.md) | Additional metadata and collection roles for representing EPUB publications. |[https//readium.org/webpub-manifest/profiles/epub](https//readium.org/webpub-manifest/profiles/epub) |
+| [PDF Profile](pdf.md) | Defines a dedicated profile for representing PDF publications. | [https://readium.org/webpub-manifest/profiles/pdf](https://readium.org/webpub-manifest/profiles/pdf) |
## Registering a profile
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+# PDF Profile
+
+**Editors:**
+
+* Michael Benowitz ([NYPL](https://www.nypl.org))
+
+**Participate:**
+
+* [GitHub readium/webpub-manifest](https://github.com/readium/webpub-manifest)
+* [File an issue](https://github.com/readium/webpub-manifest/issues)
+
+## Introduction
+
+The display of static PDF files can be governed by the standard Webpub Manifest guidelines, as the format was specifically conceived of to provide a constent, portable format. However there are many optional features, mainly pertaining to accessibility and preservation, that can be communicated to users. These features may be used in a client context or used in other ways by consuming applications.
+
+This profile is intended to ensure that full functionality of PDF resources is documented in Webpub Manifests, and conversely ensuring that PDFs with limited functionality are documented.
+
+## 1. Declaring conformance with PDF Profile
+
+In order for a Webpub Manifest to conform to this profile it must include a `conformsTo` key in the `metadata` section, with `http://readium.org/webpub-manifest/profiles/pdf` as the value.
+
+## 2. `readingOrder` resource restrictions
+
+A conforming Webpub Manifsest must only refererence PDF documenents with a media type of `application/pdf` in the `readingOrder` section.
+
+## 3. PDF Encryption
+
+If a Webpub Manifest contains encrypted resources, those resources must include an [encryption object](https://github.com/readium/webpub-manifest/blob/master/modules/encryption.md#encryption-object) in the `properties` object attached to each `Link` object.
+
+
+## 4. Link Parameters
+
+A Manifest may include the following parameters in the `href` attribute of elements in the `readingOrder` and `toc` sections.
+
+| Key | Semantics | Type | Values |
+| ----- | --------- | -------- | --------- |
+| [start](#start) | Specifies the initial page of the PDF to display when displaying this resource | Integer | 1 to (page count of current resource) |
+
+### start
+
+In some cases a system may wish to display a PDF but skip certain pages that appear at the beginning of the file, including:
+- Skipping blank pages
+- Skipping repetitive or unnecessary front matter
+- Providing a direct link to a chapter, section or sub-section within a larger PDF resources
+
+The `start` parameter conveys this information in a way that aligns with other standards for displaying and consuming PDF resources. This parameter is indexed from 1 to match the mental model for most users.
+```
+https://example.com/example.pdf?start=1 # First page, equivalent to no parameter specification
+https://example.com/example.pdf?start=2 # Second page
+https://example.com/example.pdf?start=10 # Arbitrary page position
+```
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