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@@ -3,6 +3,7 @@ module Calais
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     attr_accessor :license_id
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     attr_accessor :content
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     attr_accessor :content_type, :output_format
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+    attr_accessor :reltag_baseurl, :relevance_score
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     attr_accessor :allow_distribution, :allow_search, :submitter, :external_id
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     attr_accessor :external_metadata
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@@ -31,6 +32,8 @@ module Calais
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       def params_xml
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         content_type = @content_type && AVAILABLE_CONTENT_TYPES.keys.include?(@content_type) ? AVAILABLE_CONTENT_TYPES[@content_type] : AVAILABLE_CONTENT_TYPES[DEFAULT_CONTENT_TYPE]
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         output_format = @output_format && AVAILABLE_OUTPUT_FORMATS.keys.include?(@output_format) ? AVAILABLE_OUTPUT_FORMATS[@output_format] : AVAILABLE_OUTPUT_FORMATS[DEFAULT_OUTPUT_FORMAT]
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+        reltag_baseurl = @reltag_baseurl || ""
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+        relevance_score = @relevance_score ? "true" : "false"
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         allow_distribution = @allow_distribution ? "true" : "false"
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         allow_search = @allow_search ? "true" : "false"
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         submitter = @submitter || DEFAULT_SUBMITTER
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@@ -38,7 +41,7 @@ module Calais
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         external_metadata = @external_metadata || ""
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         xml  = %[<c:params xmlns:c="http://s.opencalais.com/1/pred/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">]
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-        xml += %[<c:processingDirectives c:contentType="#{content_type}" c:outputFormat="#{output_format}"></c:processingDirectives>]
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+        xml += %[<c:processingDirectives c:contentType="#{content_type}" c:outputFormat="#{output_format}" c:reltagBaseURL="#{reltag_baseurl}" c:calculateRelevanceScore="#{relevance_score}"></c:processingDirectives>]
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         xml += %[<c:userDirectives c:allowDistribution="#{allow_distribution}" c:allowSearch="#{allow_search}" c:externalID="#{external_id}" c:submitter="#{submitter}"></c:userDirectives>]
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         xml += %[<c:externalMetadata>#{external_metadata}</c:externalMetadata>]
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         xml += %[</c:params>]