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--></style></head><body lang=ES-CL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;color:#005393;mso-fareast-language:EN-US'>Hello,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;color:#005393;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;color:#005393;mso-fareast-language:EN-US'>I have a question, how can I apply the geoprocessing tools "symmetric difference ...", but for a single layer and not two as it come in by default. I need to apply the function to several polygon inside the one same layer. Or if there is another function that make this operation.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;color:#005393;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;color:#005393;mso-fareast-language:EN-US'>Thanks for the help.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;color:#005393;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;color:#005393;mso-fareast-language:EN-US'>Atte.,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;color:#005393;mso-fareast-language:EN-US'>_________________________<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;color:#005393;mso-fareast-language:EN-US'>Daniel</span><span lang=EN-US style='font-size:12.0pt;color:#005393;mso-fareast-language:EN-US'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>