Select to initialize the variable value with required XML
elements for valid XDP data. When the option is selected, XML variables ignore
prefixes registered for namespaces and XPath expressions do not
require the prefix. When deselected, you must use the registered
prefixes in the XPath expression.
Asset Reference:
The imported asset that defines the schema and root entity to
use for the variable.
Schema:
The XML schema to use for the variable.
Root Entity:
The entity to use as the root element of the XML value.