30,299 research outputs found
Towards structured, block-based PDF
The Portable Document Format (PDF), defined by Adobe Systems Inc. as the basis of its Acrobat product range, is discussed in some detail. Particular emphasis is given to its flexible object-oriented structure, which has yet to be fully exploited. It is currently used to represent not logical structure but simply a series of pages and associated resources. A definition of an Encapsulated PDF (EPDF) is presented, in which EPDF blocks carry with them their own resource requirements, together with geometrical and logical information. A block formatter called Juggler is described which can lay out EPDF blocks from various sources onto new pages. Future revisions of PDF supporting uniquely-named EPDF blocks tagged with semantic information would assist in composite-pagemakeup and could even lead to fully revisable PDF
Pair Formation within Multi-Agent Populations
We present a simple model for the formation of pairs in multi-agent
populations of type A and B which move freely on a spatial network. Each agent
of population A (and B) is labeled as Ai (and Bj) with i=1,.. NA (and j=1,..NB)
and carries its own individual list of characteristics or 'phenotype'. When
agents from opposite populations encounter one another on the network, they can
form a relationship if not already engaged in one. The length of time for which
any given pair stays together depends on the compatibility of the two
constituent agents. Possible applications include the human dating scenario,
and the commercial domain where two types of businesses A and B have members of
each type looking for a business partner, i.e. Ai+Bj-->Rij. The pair Rij then
survives for some finite time before dissociating Rij-->Ai+Bj. There are many
possible generalizations of this basic setup. Here we content ourselves with
some initial numerical results for the simplest of network topologies, together
with some accompanying analytic analysis.Comment: Special Issue on Complex Networks, edited by Dirk Helbin
Journal publishing with Acrobat: the CAJUN project
The publication of material in electronic form should ideally preserve, in a unified document representation, all of the richness of the printed document while maintaining enough of its underlying structure to enable searching and other forms of semantic processing. Until recently it has been hard to find a document representation which combined these attributes and which also stood some chance of becoming a de facto multi-platform standard.
This paper sets out experience gained within the Electronic Publishing Research Group at the University of Nottingham in using Adobe Acrobat software and its underlying PDF (Portable Document Format) notation. The CAJUN project1 (CD-ROM Acrobat Journals Using Networks) began in 1993 and has used Acrobat software to produce electronic versions of journal papers for network and CD-ROM dissemination. The paper describes the project's progress so far and also gives a brief assessment of PDF's suitability as a universal document interchange standard
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