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	<help>
		<element name="DESCRIPTION" text="The extension Analytical Hierarchy Process(AHP) (Saaty, 1977) is used to calculate relative weights after combining diverse factors. This algorithm uses the input layers and a table with a number of factors (equal to the number of layers), comparing their comparative weights to calculate a new layer as a linear combination  of the input layers.  " description="Description" type="0">
		</element>
		<element name="ADDITIONAL_INFO" text="" description="Additional information" type="0">
		</element>
		<element name="EXTENSION_AUTHOR" text="Victor Olaya" description="Extension created by" type="0">
		</element>
		<element name="HELP_AUTHOR" text="Victor Olaya" description="Help file created by" type="0">
		</element>
		<element name="USER_NOTES" text="" description="User_notes" type="0">
		</element>
		<element name="INPUT" text="one or various layers." description="Layers" type="3">
		</element>
		<element name="PAIRWISE" text="select one table determining the relevance of each factor contained in the said layers by comparing them one by one. The table should have n rows and n columns, n being the number of factors (this is, of layers) to which  comparative values will be assigned. It is recommended that these values  are established between 1 and 9 depending on the following rules:&#10;* 1 = The same  importance&#10;* 3 = Moderate predominance of one value over another&#10;* 5 = Strong predominance&#10;* 7 = Very Strong Predominance&#10;* 9 = Extreme Predominance&#10;* 2, 4, 6, 8 = Intermediate Values" description="Pairwise comparisons" type="3">
			<image description="Example of matrix table for three layers" file="jerarquias_analisiticas_ahp.jpg">
			</image>
		</element>
		<element name="OUTPUT_DESCRIPTION" text="" description="Description" type="2">
		</element>
		<element name="RESULT" text="Result of the linear combination of the input layers based on the wieghts established by the analytical hierarchy process." description="Result" type="2">
		</element>
	</help>
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