SSED Remove Multiline XML Code

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I'm trying to use SSED to delete multilines from a XML File. I am able to delete certain single lines within the XML file, but I need to be able to remove multilines.For example:\[code\]<tagnumberone> <tagInside>This must not be deleted</tagInside></tagnumberone><tagnumberone> <tagInside>This must be deleted</tagInside></tagnumberone><tagnumberone> <tagInside>This must not be deleted</tagInside></tagnumberone>\[/code\]So what it means that I need to be able to delete the line of code This must be deleted> and then it's outertags as well so that I get following result:\[code\]<tagnumberone> <tagInside>This must not be deleted</tagInside></tagnumberone><tagnumberone> <tagInside>This must not be deleted</tagInside></tagnumberone>\[/code\]I am trying to use following Super Sed commando: \[code\]ssed s:\<tagnumberone\>\<tagInside\>This must be deleted\<\/tagInside\>\<\/tagnumberone\>:: <file.xml >out.xmle\[/code\]This gives me the following error: unterminated 's' command.Am I missing something?Thanks!