# ISO <<Class>> MD_Resolution
# writer output in XML

# History:
# 	Stan Smith 2013-11-19 original script

class MD_Resolution

	def initialize(xml)
		@xml = xml
	end

	def writeXML(hResolution)

		@xml.tag!('gmd:MD_Resolution') do

			# resolution - specific equivalent scale
			# resolution - distance
			# one or the other is required, but not both
			scale = hResolution[:equivalentScale]
			distance = hResolution[:distance]
			uom = hResolution[:distanceUOM]
			if !scale.nil?
				@xml.tag!('gmd:equivalentScale') do
					@xml.tag!('gmd:MD_RepresentativeFraction') do
						@xml.tag!('gmd:denominator') do
							@xml.tag!('gco:Integer',scale)
						end
					end
				end
			elsif !distance.nil?
				@xml.tag!('gmd:distance') do
					attributes = {}
					attributes['uom'] = uom if uom
					@xml.tag!('gco:Distance',attributes,distance)
				end
			else
				@xml.tag!('gmd:equivalentScale',{'gco:nilReason'=>'missing'})
				@xml.tag!('gmd:distance',{'gco:nilReason'=>'missing'})
			end

		end

	end

end