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+# Document Management Module (DMS)
+
+## Overview
+
+The module adds a new `DMSDocument` model which allows management
+of large amounts of files, and their relations to pages.
+In contrast to the `File` model built into SilverStripe core,
+it aims to wrap storage and access concerns in a generic API,
+which allows more fine-grained control over how the documents are
+managed and exposed through the website.
+
+Features:
+
+ * Relation of documents to pages
+ * Management and upload of documents within a page context in the CMS
+ * Metadata management through the powerful `GridField` and `UploadField` core APIs
+ * Configurable tags for documents
+ * Download via SilverStripe controller (rather than filesystem URLs)
+ * Access control based on PHP logic, and page relations
+ * Replacement of existing files
+
+## Documents on the Filesystem
+
+While the DMS architecture allows for remote storage of files,
+the default implementation (the `DMS` class) stores them locally.
+Relations to pages and tags are persisted as many-many relationships
+through the SilverStripe ORM.
+
+File locations in this implementation are structured into 
+subfolders, in order to avoid exceeding filesystem limits.
+The file name is a composite based on its database ID
+and the original file name. The exact location shouldn't
+be relied on by custom logic, but rather retrieved through
+the API (`DMSDocument->getDownloadLink()`).
+
+Example:
+
+	dms-assets/
+		0/
+			1234~myfile.pdf
+		1/
+			2345~myotherfile.pdf
+
+
+### Requirements
+
+ * PHP 5.3 with the "fileinfo" module (or alternatively the "whereis" and "file" Unix commands)
+
+### Configuration
+
+The file location is set via the `DMS::$dmsFolder` static, and points to a location in the webroot.
+
+### Usage
+
+#### Create Documents
+
+Create by relative path:
+
+	$dms = DMS::getDMSInstance();
+	$doc = $dms->storeDocument('assets/myfile.pdf');
+
+Create from an existing `File` record:
+
+	$dms = DMS::getDMSInstance();
+	$file = File::get()->byID(99);
+	$doc = $dms->storeDocument($file);
+
+Note: Both operations copy the existing file.
+
+#### Download Documents
+
+	$dms = DMS::getDMSInstance();
+	$docs = $dms->getByTag('priority', 'important')->First();
+	$link = $doc->getDownloadLink();
+
+#### Manage Page Relations
+
+	// Find documents by page
+	$dms = DMS::getDMSInstance();
+	$page = SiteTree::get()->filter('URLSegment', 'home')->First();
+	$docs = $dms->getByPage($page);
+
+	// Add documents to page
+
+#### Manage Tags
+
+	// Find documents by tag
+	$dms = DMS::getDMSInstance();
+	$docs = $dms->getByTag('priority', 'important');
+
+	// Add tag to existing document
+	$doc = Document::get()->byID(99);
+	$doc->addTag('priority', 'low');
+
+	// Supports multiple values for tags
+	$doc->addTag('category', 'keyboard');
+	$doc->addTag('category', 'input device');
+
+	// Removing tags is abstracted as well
+	$doc->removeTag('category', 'keyboard'); 
+	$doc->removeTag('category', 'input device'); 
+	$doc->removeAllTags();
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