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# = Ruby Ecoinformatics Library
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# == What is it?
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# A tool for accessing ecological datasets and their metadata in ruby.
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# It's a way to do this:
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#    squery = '<pathquery version="1.2">...</pathquery>' # looks for all pisco-subtidal data
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#    Metacat.new('http://data.piscoweb.org/catalog/metacat') do |metacat|
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#     eml_docs = metacat.find(:squery => squery)
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#     eml_docs.each do |eml|
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#       puts eml.docid
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#       eml.data_tables.each do |data_table|
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#         puts "\t --#{data_table.entity_name}"
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#       end
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#     end
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#    end
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# Spits out :
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#    pisco_subtidal.40.1
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#             --quad_taxon_lookup_table.csv
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#             --pisco_quad_data.csv
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#    pisco_subtidal.12.4
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#             --fish_taxon_lookup_table.csv
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#             --pisco_fish_data.csv
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#    pisco_subtidal.21.7
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#             --swath_taxon_lookup_table.csv
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#             --pisco_swath_data.csv
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#    pisco_subtidal.30.2
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#             --upc_taxon_lookup_table.csv
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#             --pisco_upc_data.csv
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# For now, this library is for dealing with EML metadata and data coming out of
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# the Metacat data catalog (http://knb.ecoinformatics.org/software/metacat).
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# The Metacat client class will generally return Eml objects representing their
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# corresponding EML document. This object can then be used to access document-wide
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# metadata. Furthermore, each Eml object contains DataTable objects representing
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# their corresponding DataTable elements. For now, Eml and DataTable are mostly
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# a wrapper for a REXML:Document DOM representation of the XML data. In the future
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# they may contain more functionality.
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#
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# One very important feature of classes Metacat and DataTable is the ability to
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# read plain-text data tables by passing a block(closure) that handles fragments
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# of the file. This way data can be read without the costs of loading a huge dataset
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# directly into RAM.
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# == Status
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# The Metacat client library is very usable and I'm happy with the current documentation
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#
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# The Eml and even worse, DataTable classes are minimally functional. They also still
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# contain fragments of the original application that inspired them which should be removed
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# as they are not generally applicable. Documentation is also not up to par.
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#
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# I would recommend using the REXML:Document contained within both Eml and DataTable
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# where their methods are lacking to access metadata attributes. DataTable.read() is
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# in a usable state and handles blocks the same way as Metacat.read.
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#
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# Where documentation is lacking check the unit tests under ./tests. These sometimes
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# give a clearer picture of intended usage.
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#
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# == Examples
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# See classes Metacat, Eml, and DataTable for more examples
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# == Author
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# Chad Burt
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#
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# Marine Science Institude
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#
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# University of California, Santa Barbara
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#
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# chad@underbluewaters.net