Skip to main content

Content Types

Edlib can be extended with additional content types. Content types in Edlib are provided by standard LTI tools. If it supports LTI 1.0/1.1/1.2 and Deep Linking 1.0, it will work with Edlib. Content Author, the bundled content type provider, is one such tool.

Edlib extends LTI to add functionality that wasn't anticipated by the authors of the LTI spec, but will also work with strictly compliant LTI tools.

If you are not familiar with LTI, you should review the following specifications:

Editing content​

Editing isn't a feature described by the LTI Deep Linking (LTI-DL) specification. Edlib gets around this by optionally sending an LTI-DL request to the item URL, instead of the standard endpoint for content selection. For tools that don't support this, content selected via the default endpoint just replaces the previously selected content.

Extended LTI parameters sent to the Hub by the LTI platform​

  • ext_edlib3_return_exact_version=1

    Make the 'Use Content' button in item selections return a link to the current version of a resource.

Extended LTI parameters sent to LTI tools by the Hub​

  • ext_edlib3_embed_resize_code

    The HTML code for letting the tool know how to embed the content. This will be an <iframe> element.

  • ext_edlib3_embed_resize_code

    The HTML code for including a script to resize the embedded content. This will be a <script> element.

Resizing​

Content can request that the Hub resize its iframe height. To do this, the content should send a message like so:

window.parent.postMessage({
    action: 'resize',
    scrollHeight: 640,
}, '*');

LTI Deep-Linking 1.0 extensions​

The following attributes can be used with items of the LtiLinkItem type to communicate extra information that isn't part of the LTI Deep-Linking spec:

  • license

    • @id: https://spec.edlib.com/lti/vocab#license
    • @type: http://www.w3.org/2001/XMLSchema#normalizedString

  • languageIso639_3

    • @id: https://spec.edlib.com/lti/vocab#languageIso639_3
    • @type: http://www.w3.org/2001/XMLSchema#normalizedString

  • published

    • @id: https://spec.edlib.com/lti/vocab#published
    • @type: http://www.w3.org/2001/XMLSchema#boolean

  • shared

    • @id: https://spec.edlib.com/lti/vocab#shared
    • @type: http://www.w3.org/2001/XMLSchema#boolean

  • tag

    • @id: https://spec.edlib.com/lti/vocab#tag
    • @type: http://www.w3.org/2001/XMLSchema#normalizedString
    • Can be either a list of strings, or just a string.