EPrints 3.1 has only just been released but work on 3.2 has been progressing for some months now.<\/p>\n
One EPrints feature that we’re improving in 3.2 is document thumbnails. First a bit of background: when you view the abstract (jump-off) page in EPrints each document will have either an icon or thumbnail shown. The thumbnail images are generated when a document is uploaded.<\/p>\n
Three thumbnails are generated as standard: “small”, “medium” and “preview”. The “small” thumbnail is used as a substitute for the format icon. The “medium” thumbnail isn’t used. The “preview” thumbnail is shown whenever the user hovers the mouse pointer over the icon\/thumbnail.<\/p>\n
Thumbnails are mechanically derived versions of the uploaded documents – they’re generated by a defined process with no user interaction. There is also a text version generated from each document that contains the terms used to index that document. In future we also want to provide video previews of uploaded videos (a youtube-style interface) and lightbox versions of powerpoints etc. Another requirement is the ability to deliver cover-paged versions of documents.<\/p>\n
To support a diverse set of derived documents we have implemented relationships between documents. In 3.2. when a thumbnail is generated it is actually a new document with “isVersionOf”, “isVolatileVersionOf” and “isThumbnailVersionOf” relations to the existing document. So, if you want the “small” thumbnail of a document, you query that document for it’s “hasSmallThumbnailVersion” relation. If a document is changed all of it’s “hasVolatileVersion” relations are removed and regenerated. (Before the expert reader gets too far ahead … relations aren’t implemented using a triple-store, they’re just the metadata fields that first appeared in 3.1)<\/p>\n
Now for every document the user uploads a multitude of derived documents will be created. To avoid overloading the user with these new documents, “volatile” documents (“isVolatileVersionOf”) are hidden.<\/p>\n
If the user uses the “conversion” tool during the upload stage converted documents become a “isVersionOf” the existing document. This will be used to improve the jump-off page by bundling different formats of the same document together.<\/p>\n
All of the mechanically derived documents in EPrints are generated by “Convert” plugins, enabling extensibility of the whole system.<\/p>\n","protected":false},"excerpt":{"rendered":"
EPrints 3.1 has only just been released but work on 3.2 has been progressing for some months now. One EPrints feature that we’re improving in 3.2 is document thumbnails. First a bit of background: when you view the abstract (jump-off) page in EPrints each document will have either an icon or thumbnail shown. The thumbnail images are generated when a document is uploaded. Three thumbnails are generated as standard: “small”, “medium” and “preview”. The “small” thumbnail is used as a substitute for the format icon. The “medium” thumbnail isn’t used. The “preview” thumbnail is shown whenever the user hovers the mouse pointer over the icon\/thumbnail.Read More →<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"entry","1":"post","2":"publish","3":"author-tdb","4":"post-405","6":"format-standard","7":"category-uncategorized"},"_links":{"self":[{"href":"https:\/\/uk.eprints-hosting.org\/uk\/index.php\/wp-json\/wp\/v2\/posts\/405","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/uk.eprints-hosting.org\/uk\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/uk.eprints-hosting.org\/uk\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/uk.eprints-hosting.org\/uk\/index.php\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/uk.eprints-hosting.org\/uk\/index.php\/wp-json\/wp\/v2\/comments?post=405"}],"version-history":[{"count":1,"href":"https:\/\/uk.eprints-hosting.org\/uk\/index.php\/wp-json\/wp\/v2\/posts\/405\/revisions"}],"predecessor-version":[{"id":439,"href":"https:\/\/uk.eprints-hosting.org\/uk\/index.php\/wp-json\/wp\/v2\/posts\/405\/revisions\/439"}],"wp:attachment":[{"href":"https:\/\/uk.eprints-hosting.org\/uk\/index.php\/wp-json\/wp\/v2\/media?parent=405"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/uk.eprints-hosting.org\/uk\/index.php\/wp-json\/wp\/v2\/categories?post=405"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/uk.eprints-hosting.org\/uk\/index.php\/wp-json\/wp\/v2\/tags?post=405"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}