Referencing Resources Within Resource Files - where does/doesn't this work?

To access a string resource from within a resource file, the docs use this example:

<string id="menu_item_1_label">Item 1</string>

<menu id="MainMenu">
    <menu-item id="item_1" label="@Strings.menu_item_1_label" />
</menu>

And this other example also from the docs (indicating it works whether quoted or unquoted):

<settings>

    <setting propertyKey="@Properties.appVersion" title="@Strings.AppVersionTitle">
        <settingConfig type="alphaNumeric" readonly="true" />
    </setting>

    <setting propertyKey="@Properties.myString" title="@Strings.MyStringTitle" prompt="@Strings.MyStringPrompt">
        <settingConfig type="list">
            <listEntry value="0">@Strings.HelloWorld</listEntry>
            <listEntry value="1">@Strings.Ackbar</listEntry>
            <listEntry value="2">@Strings.Garmin</listEntry>
        </settingConfig>
    </setting>

    <setting propertyKey="@Properties.myNumber" title="@Strings.MyNumberTitle" prompt="@Strings.MyNumberPrompt">
        <settingConfig type="numeric" errorMessage="@Strings.MyNumberError" />
    </setting>

    <setting propertyKey="@Properties.screenSleep" title="@Strings.ScreenSleepTitle">
        <settingConfig type="boolean" />
    </setting>

    <setting propertyKey="@Properties.username" title="@Strings.UsernameTitle">
        <settingConfig type="alphaNumeric" required="true" />
    </setting>

</settings>

<resources>

    <properties>
        <property id="pushupTitle_prop" type="string">@Strings.pushupTitle</property>
    </properties>

</resources>

In this case, "@Strings.pushupTitle" gets passed through as a string literal without resolving to the value of "pushupTitle" from the resource file (ie I get "@Strings.pushupTitle" displayed on the screen).

I saw the same behaviour in a <jsonData> block.

So it seems that string resources are not parsed/converted everywhere they occur in a resource file (at least not in <properties>, <jsonData>, but anywhere else?)..

What are the rules regarding where they will/won't be parsed, is it documented somwhere?

Thanks for any help