function debug(oElement) {
				if (bDebug) {
					Log.debug(
						getNestingLevel() + Array.prototype.slice.call(arguments, 1).join(" "),
						oElement && serializeSingleElement(oElement), sXMLPreprocessor);
				}
			}
Returns a callback interface instance for the given map of variables which
override currently known variables of the same name in <code>this</code>
parent interface or replace them altogether. Each variable name becomes a
named model with a corresponding object binding and can be used inside the
XML template in the usual way, that is, with a binding expression like
<code>"{var>some/relative/path}"</code> (see example).

<b>Example:</b> Suppose the XML pre-processor knows a variable named "old"
and a visitor defines a new variable relative to it as follows.
Then {@link sap.ui.core.util.XMLPreprocessor.ICallback.getResult getResult}
for a binding which refers to the new variable using a relative path
("{new>relative}") has the same result as for a binding to the old variable
with a compound path ("{old>prefix/relative}").

<pre>
oInterface.with({"new" : oInterface.getContext("old>prefix")})
    .getResult("{new>relative}")
    === oInterface.getResult("{old>prefix/relative}"); // true
</pre>

BEWARE: Previous callback interface instances derived from the same parent
(<code>this</code>) become invalid (that is, they forget about inherited
variables) once a new instance is derived.

@param {object} [mVariables={}]
  Map from variable name (string) to value ({@link sap.ui.model.Context})
@param {boolean} [bReplace]
  Whether only the given variables are known in the new callback interface
  instance, no inherited ones
@returns {sap.ui.core.util.XMLPreprocessor.ICallback}
  A callback interface instance

@function
@public
@see sap.ui.core.util.XMLPreprocessor.ICallback.getResult
@since 1.39.0