Re: how to change node value based on other node value

but that doesnt work. I cant figure out how to change the voltage based on the value of Name.

"doesn't work" isn't diagnostic ... :)

but, even in xpath, you can't make syntax up :) grab xpather.pl and see what it spits out

/Settings/Channels/Channel[4]

# posy
/Settings[1]/Channels[1]/Channel[4]

# star
/*[ local-name() = "Settings"
    and position() = 1
  ]

/*[ local-name() = "Channels"
    and position() = 1
  ]

/*[ local-name() = "Channel"
    and @Name = "L360"
    and @Voltage = "120"
    and @Test = "1"
  ]


# rats
/Settings[1]
 /Channels[1]
 /*[ name() = "Channel" and position() = 4 and @Name = "L360" and @Vol
+tage = "120" and @Test = "1" ]
[download]

So next step is adjust your xpath to be valid :)

Comment on Re: how to change node value based on other node value Download Code

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Re^2: how to change node value based on other node value by ccherri (Acolyte) on Apr 08, 2015 at 17:30 UTC
wow Anonymous Monk, that is cool. But whaddaya mean I can't just make up my own syntax??? Seriously tho, I want to know how this works so I can learn and stop asking newbie questions (been at perl a few years now, xml about a week). So I see #posy and that looks like an xpath and returns (using findnode) an indexed channel (but I don't see how that guarantees it is the channel i want based on name, not index value) and star and rats throw me. I tried all reasonable variations as xpaths and get nothing but errors (invalid expression) or empty results. I see using the //tagname option limits the output to the bits I am interested in but still am not sure what to make of it. Any help or pointers to help is much appreciated. ~Chris	[reply]
Re^3: how to change node value based on other node value by Anonymous Monk on Apr 08, 2015 at 22:50 UTC
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" ] } )`	[reply] [d/l] [select]