UrbanCode Deploy - Using the query symbol to reference properties

 I was looking at an existing UrbanCode Deploy (UCD) element, known as a Component, and noticed that it made reference to an existing Property, but also included a query symbol ( ? ) within the configuration.

So, as an example, rather than referencing an existing Property via the conventional ( for UCD ) syntax of: -

${p:userName}

it instead referenced it using a query: -

${p?:userName}

which confused me initially.

Given that I am using UCD 6.2.7, I checked the documentation: -

IBM UrbanCode Deploy V6.2.7 documentation

Properties

Referring to properties

Use the ? syntax if you are not sure about a property name:

${p?:propertyName}

This syntax returns a blank if the property is not found, and avoids the undefined property error.

Which is useful to know ....