A key-path contains a chain of keys. Each key in such a chain is a more detailed determination of the previous key.

 Attribute key

An attribute-key is an attribute of the previous key, like in: 

<cx:write value="$activity.toCompany.name"/>

 In previous example the name is an attribute-key of toCompany.

Function key

Besides the attribute-keys there also exists so called function-keys. A function-key presents a transformation of the previous key. For instance there exists a key lowercaseString that delivers the exact same text of the previous keybut all in lower case characters.
You would use it as follows:

<cx:write value="$activity.toCompany.name.lowercaseString"/>

In previous example existing upper case characters in the name of the company would be changed into lower case characters.

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