These are the steps publishers need to take to get started with Crossmark:
Drop an email to firstname.lastname@example.org to let us know that you want to get started with Crossmark. Crossmark fees are activated when you start to deposit, and are USD $0.20 for current content, $0.02 for back file (older than two years).
Create a page on your website explaining that you are participating in the Crossmark service and have committed to maintaining version of record copies of content that display the Crossmark button. This page should be registered and have a DOI to enable persistent linking. It should explain your policies on corrections, retractions, withdrawals and other updates, and may contain definitions and explanations of any additional custom metadata fields that are being used. The page could also include links to other relevant policies such as author submission guidelines, peer review guidelines, etc.
The minimum required Crossmark metadata comprises: - The DOI of the content the Crossmark is being applied to - The DOI for the publisher’s Crossmark Policy Page - The DOI of any piece of content that is being updated
“Updates” should only be deposited for changes that are likely to affect “the interpretation or crediting of the work.” In other words, updates should only be deposited for editorially significant changes. Updates should not be deposited for minor changes such as spelling corrections, formatting changes, etc.
There are 12 defined types of accepted “update” within Crossmark. The values for these are:
If an update does not fall into one of these categories it should instead be placed in the “more information” section of the pop-up box by being deposited as an assertion.
You should ensure that the DOI is embedded in the head of the HTML metadata for all content to which Crossmark buttons are being applied as follows:
<meta name=”dc.identifier” content=”doi:10.5555/12345678”/>
v2.0 is the current version. This update brings a responsive Crossmark box and new button designs. Please use the widget as specified below and do not alter the script or host the button locally.
<!-- Start Crossmark Snippet v2.0 --> <script src="https://crossmark-cdn.crossref.org/widget/v2.0/widget.js"></script> <a data-target="crossmark"><img src="https://crossmark-cdn.crossref.org/widget/v2.0/logos/CROSSMARK_BW_horizontal.svg" width="150" /></a> <!-- End Crossmark Snippet -->
Crossmark metadata needs to be added to your PDF content. Minimally, this metadata must include the DOI of the content and the optional Crossmark domain(s).
You may wish to use our open source tool called “pdfmark” for embedding metadata in PDF files.
We have also created “pdfstamp”, an open-source command line tool that makes it possible to add an image or “stamp” to any location on a PDF and to link that image to a chosen URL.
The link structure for Crossmark links from PDFs looks like this:
The domain argument tells the Crossmark system what kind of static content the link is coming from. This will change for different static formats (e.g. epub, etc.)
The date_stamp argument tells the Crossmark system the date on which a last “Major Version” of the PDF was generated. In the vast majority of the cases, this will just be the date on which the article was published. However, in cases where a publisher makes significant corrections to a PDF in-situ (they do not issue a separate correction or new version of the document with a new DOI) then the date_stamp should reflect when the PDF was regenerated with the corrections. The system will then use the date_stamp in order to tell whether the researcher needs to be alerted to updates or not. The date_stamp argument should be recorded in the form yyyy-mm-dd. (ISO 8601)