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| The Open Citation Project - Reference Linking for Open Archives |
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U.S. Partners: Paul Ginsparg ( Los
Alamos National Laboratory) Joe
Halpern ( Cornell) Carl
Lagoze (Cornell)
U.K. Partners: Stevan Harnad
(Southampton) Wendy Hall (Southampton)
Les Carr (Southampton)
Associated Organizations: Association
of Computer Machinery (ACM) British
Computer Society (BCS)
PROJECT SUMMARY: The Los Alamos Eprint Archive (LANL) is a remarkable public repository for a substantial and growing proportion of the current research literature in Physics. It is rapidly becoming the primary way that the world physics community is accessing its literature. At this time, not only does there exist a very natural means of making this rich resource much more powerful and useful for its current physicist users (at least 35,000 worldwide daily), but its capabilities stand ready to be extended and universalized, so as to be able to render the same service for all the rest of the disciplines, whether within the LANL Archive itself, or in other archives designed along the same lines.
The key to this enhancement of LANL's present functionality and its extension to the rest of science and scholarship, is citation-linking. The World Wide Web is predicated on hypertext connections between documents, but for the scientific/scholarly world the scholarly link par excellence is formal citation of one paper by another. This is the way researchers have naturally been interconnecting their writings all along, but until know it has only been possible to follow those connections off-line, piece-wise, mediated by a great deal of real footwork in between. Now the entire corpus can be navigated via citations on-line.
Commercial journal publishers, along with secondary indexing/abstracting services, are exploring ways of interconnecting the on-line journal literature, but those initiatives are intrinsically and severely limited by the fact that that literature is criss-crossed with financial firewalls that prevent free navigation via full texts and their citations until and unless the access fees for each full text "hit" is first paid through subscription, site-license or pay-per-view. (To allow the full texts to be browsed for free would be equivalent to giving away the literature for free in the on-line medium.)
The Los Alamos Archive does not have this constraint; hence the citation linking can be done almost immediately, yielding seamless public access worldwide to the entire corpus. The OpCit project accordingly brings to bear the prior expertise and experience of the Open Journal and CogPrints team at Southampton UK, who have successfully developed (on a much smaller but interdisciplinary database) the citation linking tools that can now be applied and further developed to completely intralink LANL. To benefit from the citation linking, both the User and the Author interfaces to LANL have to be redesigned so as to adapt them to this advanced form of navigation and to universalize them for all disciplines. It is the Cornell team, with their track record of success in solving the associated interoperability and metadata problems with NCSTRL and CoRR who will be applying their expertise and experience here. And of course the unique success of the LANL team in having designed the Archive and its robust software, rendering it the indispensable resource it is, makes it the critical core partner in this collaboration. LANL is in many ways a microcosm for the future direction of the research literature on the Web as a whole. The OpCit project is also being undertaken in association with the Association of Computing Machinery in the US and the British Computer Society in the UK.
It is hoped that this project, if successful, will both focus and accelerate progress in a direction that will be beneficial to the world scholarly/scientific community.
To implement this immediately, the entire preprint and reprint literature
would need to be available online in a usable, unified form. It is not,
yet. But a sufficiently large and representative subset of it is:
<http://xxx.lanl.gov/cgi-bin/show_monthly_submissions
>.
So the work can start on that subset now, and successful results based
on it will not only generalize to the rest of the literature, once it is
all online, but it will serve to draw it online more quickly.
The LANL Archive represents a substantial body of literature in Physics, Mathematics and Computer Science, but the full texts are archived in a variety of forms, from HTML to TeX to PDF to PS, and the first problem that needs to be solved is designing a way to integrate and navigate them seamlessly.
One especially important feature of full texts -- their reference list -- is arguably the most natural and powerful way of interconnecting and navigating this literature. The "links" are already provided by the authors themselves, and users already have a long, skilled tradition of navigating with them "offline" (looking up the references in paper).
In the recently completed, JISC-funded Open Journal and CogPrints Projects,
the UK partners (Wendy Hall, Stevan Harnad, Les Carr) have successfully
used citation linking to interconnect a small but interdisciplinary
"seed" database of full texts in the Cognitive Sciences with a much
larger 10-year set of abstracts and their reference lists from a subset
of the ISI (Institute for Scientific Information http://www.isinet.com/prodserv/citation/citsci.html
) journal citation database in the Cognitive Sciences (Psychology,
Neurobiology, Computer Science, Linguistics, Philosophy). This work has
already gone some way toward solving the problem of automatically recognizing
and linking (within and between texts) the finite but noisy set of existing
citation formats (Hitchcock
et al. 1997a-c, 1998a,b; Giles
et al. 1998; Bolacker
et al. 1998). The reaction of users was exhilaration with citation-based
navigation, but frustration at accessing only abstracts. The obvious conclusion
to be drawn was that the real power of citation linking can only be realized
with full-text linking. That is what the LANL Archive makes possible.
The LANL Archive has an additional interest from the standpoint of usage
and citation analysis: It consists of both unpublished preprints and refereed
reprints (the reprint often replacing the preprint as soon as it is available).
Directly because of the impact of the LANL Archive in physics, a new form
of citation has lately appeared (in both the paper and the online literature):
citing the LANL preprint number ( Youngen
1998). This is almost certain to become a standard practise and must
hence be covered as a special case of citation linking, so that the link
can be dynamically updated and aliased as soon as the reprint takes the
place of the preprint. But the emerging patterns of preprint vs. reprint
citation and use are also a natural object of analysis by OpCit;
it is a revealing microcosm of the overall transitional process that is
taking place as this new medium evolves its niche in scholarly and scientific
research practise (Harnad 1990).
But now the adaptation has to go beyond the physics community, which is already accustomed to the present LANL deposit interface and procedure, to other disciplines that are entirely unfamiliar with both LANL and Eprint archiving. The NCSTRL/CoRR/ACM experience and expertise in designing more generalized interfaces and in solving interoperability and metadata problems (Halpern & Lagoze 1999) will be a valuable partner in this deposit redesigning and universalizing component. In addition, the constraint of citation linking itself will provide a common skeletal structure for the rest of the redesigning and unifying efforts: The full range of variation in citation formats exists in all disciplines; hence this skeletal structure must be extractable from all texts, in a form that can then be used for hypertext linking. The adaptations -- in both the interface and the infrastructure for depositing texts -- that will be dictated by the need to extract and link citations in the texts, their reference lists, and the texts they cite, for all formats, will also constrain the texts as a whole, the formats in which authors are encouraged to submit them, and the way those formats are processed by the deposit software. In other words: whatever it takes to make all deposits interoperable specifically for citation extraction and linking will also help to make them interoperable in other respects, because citation linking is a representative microcosm of text linking in general.
To the extent that these citation-specific adaptations influence author
practices, they should also help speed the standardization of formats and
procedures that will eventually converge on the optimal universal resource
for the learned research community.
The objective here is to redesign the interface, infrastructure and
navigational software so that all papers are retrievable in a citation-linked
format (currently HTML or PDF), with the result that once a user has retrieved
an entry-level paper, navigation of the entire archive can continue via
citation-links, with no need to launch another top-down search (although
the top-down capabilities -- keyword, author, and even full-text search
of the archive -- would continue to be available at the paper level). Algorithmic
content classification, essentially by citation parsing and other methods,
and navigation based on that, will also be incorporated. [See, for example
http://www.columbia.edu/~fms5/astitl.html]
One of the many advantages of now extending this work to this uniquely comprehensive and heavily used database (LANL) is that partial results can be used to hasten progress toward fuller results: There will immediately be a subset of the Archive that can be fully citation-linked using our current tools: the subset that has correctly specified, well-formed bibliographic citations typeset by software which maintains the textual contents of the page. This subset can then be fully linked to all papers it cites that are in the Archive (even to those that are not yet themselves further linkable; their titles, author-names, abstracts and keywords will be enough to find them).
Users will accordingly have a chance to experience and compare functionality under two conditions: when they retrieve papers whose full texts are also linked, and when they retrieve papers that are dead-ends, like the abstracts that frustrated the users of the ISI/Open Journal Cognitive Science database. [Trying to retrieve a dead-end paper can be made to trigger an automatic email to the author of that paper indicating that a user has attempted to "cite-visit" it, but this was not possible because the author had not yet provided a version from which linkable citation data could be derived. This could be accompanied by clear instructions on how to provide such a version now; authors could indicate whether they wanted to see such access-failure reports for their deposited work instantly, weekly, monthly, semi-annually, or never.]
This double inducement -- (i) from experience as a user, able to fully
cite- navigate some papers but unable to do so with others because they
had not been archived in a form that could be citation linked, and (ii)
from experience as an author, learning of unsuccessful attempts to cite-navigate
through one's work via citation links -- should help to accelerate and
focus changes in author practises that will increase the ratio of useable
documents even as we are working directly on solving the problems of extracting
still more from the present formats after the first partial quick- linking
of the papers with the readily identifiable citation formats.
Author-end citation patterns will be analyzed to determine the scope of the Archive: What proportion of citations point to current papers that are in the Archive? what proportion to current papers that are not in the archive? or to papers that pre-date the Archive? to books? to papers in their unrefereed preprint form? to papers in their final published form? how do these patterns change as the Archive's holdings grow, as its user-base grows, as its years of coverage grow?
Reader-end citation-based navigation patterns will be analyzed to determine
how the Archive is used: This is entirely new bibliometric territory, because
citation searching has only been possible offline until now, so there was
no systematic way to study it. The data will be used both as feedback for
optimizing the features of the user interface (2), and to evaluate the
overall success of OpCit.
The general applicability of these techniques to interoperable digital library architectures (Lagoze & Payette 1998; Leiner 1998) will be pursued. Steps will be taken toward establishing a set of standards for the low-level interoperability i.e., a means of communicating meta-data and meta-information not only between the existing mirror servers within the current archive network, but also between the archive network and other resources.
In particular, the current situation in which citations are simply associated
once and for all with destination URLs must be addressed. For practical
flexibility, the recognition and analysis of citation information must
be separate from document format convention or locus (e.g., in the LANL
Archive, the primary/secondary publisher archive or the aggregation agent
to which the citations may eventually be linked). The use of the emerging
scholarly publishing standard, SLinkS (Hellman
1998), will also be investigated towards this end. It is also currently
impossible to convert mathematical markup to html. MathML (a realization
of XML) is on the horizon and promises to improve this situation.
Some commercial publishers have now started to provide citation links
from articles which they own into selected online bibliographic services.
[It is noteworthy that it has been partners in the Open Journal project,
namely, BioMedNet (Hitchcock et al 1998a)
and ISI (Hitchcock et al 1998b), who
have been among the first to do so, along with The
Institute of Physics, which developed its HyperCite service (IOP Publishing
1996).] The LANL Archive, however, does not have any of the commercial
firewall and barrier problems that arise between proprietary databases,
and in physics it has incomparably greater self-contained coverage of the
current literature.
The Distributed Link Service (DLS), which applied these links, was a WWW implementation of the hypertext techniques that had previously been demonstrated in Southampton University's Microcosm research environment (Carr et al. 1995, 1996a, 1998a). It made use of a WWW proxy environment to add links to HTML or PDF documents while they were delivered from a digital library (in plain, unlinked form) to a user's browser (with links integrated into them). The DLS software used various modules, called "agents" (because they have an "expertise" at automatically recognising particular kinds of information in the document) (Carr et al. 1998b):
1. The keyword-agent is very simple and uses various databases of stand- alone links (which can be key words or other text strings) and attaches them to the papers whenever those strings appear.
2. The name-agent looks for different appearances of a name [e.g. "Leslie Carr", "Carr, L." or "Carr et al."], possibly in a specified context.
3. The citation-agent recognises occurrences of citations in academic papers in a large (and extendable) variety of formats and analyses their contents to determine author, year, publisher, page range and the like. It uses this information from each citation to perform a lookup in a bibliographic database and to add a link to either the online full text of the cited article (if the database shows that it is available) or to the bibliographic record consisting of abstract and citations (from the ISI database).
8.0 Application and Further Development of Open Journal Software
The OJ project yielded a set of generalizable tools that are immediately applicable to the LANL Preprint Archive. The following tools work on PDF or HTML documents:
Link Harvester: A stand-alone program that extracts pre-existing links from a document and adds them into a database. A new link-free version of the document is also generated.
Link Interpolater: A stand-alone program that inserts links from a database into a document. If different sets of databases are selected, the same document can be linked into different navigation strategies (e.g., citation, keyword, overlaid subject index).
Citation Harvester: A stand-alone program that extracts citations from a paper's reference lists for storage in a database.
Citation Interpolater: A stand-alone program that inserts links into a document based on the contents of a citation database. Links can be added to other documents in the same archive, to documents in other archives, or to generic bibliographic citation databases (such as ISI's Web of Science).
[To see a fragment of the first page of an ACM DL library article with
both keyword and person links added wherever interesting people and systems
are mentioned: http://www.staff.ecs.soton.ac.uk/~lac/somewords/image4.gif
To see another fragment from an ACM DL article that has been automatically
populated with links to the ACM library from any citation of CACM or an
ACM Hypertext Conference: http://www.staff.ecs.soton.ac.uk/~lac/somewords/image5.gif
]
9a. Other Kinds of Links: Papers can be automatically provided with other kinds of links using distributed link overlays as demonstrated in the Microcosm and DLS technologies (developed at Southampton by two of the partners, Wendy Hall and Les Carr) (Carr et al. 1996b; DeRoure et al. 1996). http://www.mmrg.ecs.soton.ac.uk/publications.html These overlays can include links based on keywords, author-names (pointing to papers other than the explicitly cited ones), glossaries/indices, and even an inverted index for the corpus as a whole.
9b. Revision/Update Linking: There is no reason a research report should remain in a "frozen" state after it is published. The published version, suitably tagged, is a permanent formal milestone, especially for citation purposes, but an interlinked Archive also allows authors to deposit updated and revised drafts. The automatic linking system could be adapted to accommodate this, providing automatic forward and backward linking between versions.
9c. Commentary Links: For the same reason that links from unpublished preprints to refereed reprints to revised drafts of papers are of value, so are links to comments on papers, and authors' replies to comments. (One of the partners, Stevan Harnad, has special expertise in this area, being the founder and editor of two peer commentary journals, a paper journal of over 20 years standing (Behavioral and Brain Sciences (BBS) http://www.princeton.edu/~harnad/bbs.html ) and an online journal of almost 10 years standing (Psycoloquy http://www.princeton.edu/~harnad/psyc.html ) (Harnad 1984d, 1998a).
9d. Journal Links: There are several ways in which LANL can be useful to the journals in which its papers are published. LANL can provide links to the version of a paper in the journal's own official online archive. It can also provide links to cited papers in the journal's online archive that do not appear in LANL. Authors might wish to have arrangements for official links with the published version in order to provide an authenticated draft, or one in which the paper page images can be viewed or cited by page and line.
9e. Peer Review: Another useful service that LANL could provide to the journals in which its papers are published it is already beginning to provide: Authors submitting papers to the American Physical Society Journals (APS) can already do so by simply specifying the LANL version as their official submission. Referees can then be directed to that citation- enhanced draft in reviewing it. A password-controlled, non-public sector could also be created in LANL that would allow referee reports to be linked just as commentaries are in 9d above, but under the control of each journal. This would effectively be the implementation of online peer review for journals, and might be a model for the future relationship between refereed journals and public archives like LANL. Journals could also upload their final drafts to LANL for distribution in their own formats with journal-specific identifying graphics, etc. (The official journal version would then be part of the paper's overall revision "history," which could continue with comments, responses and updates; Harnad 1990d, 1992c.)
(A partner, Stevan Harnad, has extensive experience with peer review (Harnad 1982d, 1985f), including online peer review (Harnad 1996a, 1998a,h), likewise in association with a JISC-supported Project, the Eprint Archive in the Cognitive Sciences, CogPrints http://cogprints.soton.ac.uk as well as http://opcit.eprints.org .
9f. Links to Proprietary Databases: Citation links leading out of the Archive could also go to proprietary databases that charge for their services. These could include journal archives, archives of scanned contents of journal back issues of journals, electronic books, and secondary publisher databases, such as INSPEC, MEDLINE or ISI. There are, however, strategic questions about whether LANL should implement links that entail charges to the user (Harnad 1998e).
9g. Links to Other Public Archives: Provisions could be made for citation links to papers in public archives other than LANL, but it may be more useful to merge other public archives with LANL (as they are not competing in any sense, and only stand to benefit from economies of scale and shared resources and development), perhaps through interfaces such as NCSTRL, into one seamless interconnected Archive; this too would provide constraints to help guide convergence into a unified global archive (Hitchcock et al. 1997c).
9h. Links to Authors' Home Server Archives: Apart from mirroring, one
useful form of redundancy that LANL might encourage is that all its authors
should also archive their papers on their home servers, to which the LANL
version would also be linked. Links to the author's email address and URL
should also be standard components of the LANL version (Harnad 1995h).
Both the resources and the expertise of the team assembled for OpCit are arguably the best in the world for this undertaking: The uniqueness of the LANL archive and the contributions of its creator, Paul Ginsparg, are beyond dispute. NCSTRL/CoRR and the Cornell group are the leaders in universalized gatewaying and interoperability of online resources and the Open-Journal/CogPrints team at Southampton are the leaders in journal and archive integration and linking. The huge, international usership of LANL, extended still further by the NCSTRL universal gateway, guarantees that the proposed enhancements will not only be widely tested, but that, if successful, they will strongly influence the evolution of online archiving of the learned literature as a whole. There is no question that radical changes in scholarly/scientific publishing and communication practices are poised to take place. OpCit will help to guide and hasten them in the right direction.
FOOTNOTE
*"Papers" may be too specific; we would want books connected too, and
databases, audio, video, multimedia; but OpCit will only
be concerned directly with papers (and their associated graphics), although
the results should be readily generalizable to books too. "Papers" is also
quite general, for it includes not only the refereed journal literature,
but also the unpublished preprint literature, which blends into it continuously.
Indeed, the preprint literature will be our starting point, as there are
reasons to expect that it may grow to subsume the rest.
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