<?xml version="1.0" encoding="UTF-8"?> <?xml-stylesheet type="text/xsl" href="reviews.xsl"?> <reviews> ... </reviews>
A transformation of the example XML document into XHTML.
<record>
<header>
<identifier>oai:arXiv.org:adap-org/9311003</identifier>
<datestamp>2008-02-03</datestamp>
<setSpec>nlin</setSpec>
<setSpec>q-bio</setSpec>
</header>
<metadata>
<oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/
http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
<dc:title>Chaos as a Source of Complexity and Diversity in Evolution</dc:title>
<dc:creator>Kaneko, Kunihiko</dc:creator>
<dc:subject>Nonlinear Sciences - Adaptation and Self-Organizing Systems</dc:subject>
<dc:subject>Quantitative Biology</dc:subject>
<dc:description> The relevance of chaos to evolution is discussed in the context of the origin
and maintenance of diversity and complexity. Evolution to the edge of chaos is
demonstrated in an imitation game. As an origin of diversity, dynamic
clustering of identical chaotic elements, globally coupled each to other, is
briefly reviewed. The clustering is extended to nonlinear dynamics on
hypercubic lattices, which enables us to construct a self-organizing genetic
algorithm. A mechanism of maintenance of diversity, ``homeochaos", is given in
an ecological system with interaction among many species. Homeochaos provides a
dynamic stability sustained by high-dimensional weak chaos. A novel mechanism
of cell differentiation is presented, based on dynamic clustering. Here, a new
concept -- ``open chaos" -- is proposed for the instability in a dynamical
system with growing degrees of freedom. It is suggested that studies based on
interacting chaotic elements can replace both top-down and bottom-up
approaches.</dc:description>
<dc:description>Comment: to appear in Artificial Life</dc:description>
<dc:date>1993-11-25</dc:date>
<dc:type>text</dc:type>
<dc:identifier>http://arxiv.org/abs/adap-org/9311003</dc:identifier>
</oai_dc:dc>
</metadata>
</record>
The OAI-PMH specification defines six verbs (or commands) that a harvester can issue to a repository. The verbs are given as parameters in the URL to the OIA-PMH data provider server. In the examples below arXiv.org is used as the data provider. The base URL to the server is http://arxiv.org/oai2.
| Verb | Description and example |
|---|---|
| Identify | Describes the service. Example: http://arxiv.org/oai2?verb=Identify |
| ListMetadataFormats | Lists the metadata formats available. Example: http://arxiv.org/oai2?verb=ListMetadataFormats |
| ListSets | The metadata can be divided into sets (for instance by discipline or faculty).
The response to this verb will be a list of all these sets in the repository.
Example: http://arxiv.org/oai2?verb=ListSets |
| ListIdentifiers | Lists all identifiers to the items in the repository. The parameter
metadataPrefix is also mandatory when using this verb.
Example: http://arxiv.org/oai2?verb=ListIdentifiers&metadataPrefix=oai_dc |
| ListRecords | Lists all record in the metadata format provided by the metadataPrefix
parameter. Example: http://arxiv.org/oai2?verb=ListRecords&metadataPrefix=oai_dc&set=nlin |
| GetRecord | Fetches a record with a given identifier and metadata format. Example: http://arxiv.org/oai2?verb=GetRecord&metadataPrefix=oai_dc&identifier=oai:arXiv.org:adap-org/9311003 |
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