Many Metrics. Such Data. Wow.

[ Crossref Labs loves to be the last to jump on an internet trend, so what better than than to combine the Doge meme with altmetrics? Note: The API calls below have been superceeded with the development of the Event Data project. See the latest API documentation for equivalent functionality Want to know how many times a Crossref DOI is cited by the Wikipedia? Or how many times one has been mentioned in Europe PubMed Central?

DOIs unambiguously and persistently identify published, trustworthy, citable online scholarly literature. Right?

The South Park movie , “Bigger, Longer & Uncut” has a DOI: a) So does the pornographic movie, “Young Sex Crazed Nurses”: b) And the following DOI points to a fake article on a “Google-Based Alien Detector”: c) And the following DOI refers to an infamous fake article on literary theory: d) This scholarly article discusses the entirely fictitious Australian “Drop Bear”: e)


If you’ve ever thought that scholarly citation practice was antediluvian and perverse- you should check-out patents some day. Over the past year of so Crossref has been working with Cambia and the The Lens to explore how we can better link scholarly literature to and from the patent literature. The first object of our collaboration was to attempt to link patents hosted on the new, beta version of The Lens to the Scholarly literature.

OpenSearch/SRU Integration Paper

Since I’ve already blogged about this a number of times before here, I thought I ought to include a link to a fuller writeup in this month’s D-Lib Magazine of our OpenSearch service which serves as a case study in OpenSearch and SRU integration: doi:10.1045/july2010-hammond

Recommendations on RSS Feeds for Scholarly Publishers

We’re pleased to announce that a Crossref working group has released a set of best practice recommendations for scholarly publishers producing RSS feeds. Variations in practice amongst publisher feeds can be irritating for end-users, but they can be insurmountable for automated processes. RSS feeds are increasingly being consumed by knowledge discovery and data mining services. In these cases, variations in date formats, the practice of lumping all authors together in one dc:creator element, or generating invalid XML can render the RSS feed useless to the service accessing it.

OAI-ORE: Workshop Slides


thammond – 2009 May 26

In Interoperability

An Overview of the OAI Object Reuse and Exchange Interoperability Framework View more Microsoft Word documents from hvdsomp. This is a very slick presentation by Herbert Van de Sompel on OAI-ORE which he’s due to give today for a workshop at the INFORUM 2009 15th Conference on Prrofessional Information Resources in Prague. It’s on the long side at 167 slides but even if you just flip though or sample it selectively you’ll be bound to come away with something.

PRISM Aggregator Message


thammond – 2009 May 08

In Interoperability

The new OAI-PMH interface to sports one particular novelty which may well be of interest here: it makes use of the PRISM Aggregator Message. (For an announcement of this service see the post on our web publishing blog Nascent.)

As a protocol for the harvesting of metadata records within a digital repository, OAI-PMH records may be expressed in a variety of different metadata formats. For reasons of interoperability a base metadata format (‘Dublin Core’) is mandated for all OAI-PMH implementations. The expectation is that this base format would be augmented by community-specific vocabularies.

Our natural inclination was to mirror the article descriptions which we already circulate in our RSS feeds and within our HTML pages (as META tags) and PDF files (as XMP packets). In these cases we have used open data models (e.g. RDF) with simple properties cherry-picked from the DC and PRISM namespaces. But OAI-PMH has a special ‘gotcha’ in this regard: any metadata format must allow for W3C XML Schema validation. That is, the properties need to be constrained by an XSD data model. Enter PRISM Aggregator Message (PAM).


Crossref Citation Plugin (for WordPress)

OK, after a number of delays due to everything from indexing slowness to router problems, I’m happy to say that the first public beta of our WordPress citation plugin is available for download via SourceForge. A Movable Type version is in the works.

And congratulations to Trey at OpenHelix who became laudably impatient, found the SourceForge entry for the plugin back on February 8th and seems to have been testing it since. He has a nice description of how it works (along with screenshots), so I won’t repeat the effort here.

Having said that, I do include the text of the README after the jump. Please have a look at it before you install, because it might save you some mystification.

connecting things: bioGUID, iSpiders and DOI

Ed Pentz

Ed Pentz – 2007 September 07

In Interoperability

David Shorthouse and Rod Page have developed some great tools for linking references by tying together a number of services and using the Crossref OpenURL interface amongst other things. See David’s post - Gimme That Scientific Paper Part III and Rod’s post on OpenURL and using ParaTools - “OpenURL and Spiders“.

Unfortunately our planned changes to the Crossref OpenURL interface (the 100 queries per day limit in particular) caused some concern for David (“Crossref Takes a Step Back“) - but make sure you read the comments to see my response!

We decided to drop the 100 per day query limit for the OpenURL interface and there will be no charges for non-commercial use of the interface -

Microsoft to Support OpenID


admin – 2007 February 08

In InteroperabilityStandards

Kim Cameron, Microsoft’s Identity Czar and member of the Identity Gang, comments on Microsoft’s announcement that they will support OpenID. Another sign that federated identity schemes are gaining traction and OpenID is likely to emerge as a standard the publishers are going to want to grapple with soon. This follows Doc Searl’s comments on the notion of “Creator Relationship Management” where he speculates that the techniques being used in federated identity schemes and the Creative Commons can be combined to create a new “silo-free” value chain amongst creators, producers and distributors.
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