um, as a path you wrote  '/Settings/Channels/Channel/Name="L1"'

xpather shows what you should have written 

/Settings[1]
 /Channels[1]
 /*[ name() = "Channel" and @Name = "L1"]

[download]

or findnodes( q{ //Channel[ @Name = "L1" and @Voltage = "400" ] } )

In reply to Re^3: how to change node value based on other node value by Anonymous Monk
in thread how to change node value based on other node value by ccherri

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