XPath to modify Application Settings in Web Config

Question

I am using XPath to modify some settings in my application's config file during a UCD deploy, however I can't figure out the right path to use.

I am able to change the connection string no problem but the application settings uses a different syntax that I can't get XPath to match.

This is the XPath I used:

//configuration/applicationSettings/ServiceTaskFunctions.Properties.Settings/setting[@name='Hello']/@value->${p:environment/World}

${p:environment/World} being an environment property that I am confident works because the connection string works the same way.

I expected the following:

<setting name="Hello" serializeAs="String">
<value>World</value>
</setting>

But what I got was:

<setting name="Hello" serializeAs="String">
    <value></value>
</setting>

Answer 1

The entity value is an element and not an attribute.
So change /@value to /value like this:

//configuration/applicationSettings/ServiceTaskFunctions.Properties.Settings/setting[@name='Hello']/@value

to

//configuration/applicationSettings/ServiceTaskFunctions.Properties.Settings/setting[@name='Hello']/value