Translation(xliff) file example:

<?xml version="1.0"?>
	<xliff xmlns="urn:oasis:names:tc:xliff:document:1.1" version="1.1">
		<file original="php-sourcecode" source-language="de" target-language="en" datatype="php">
			<body>
				<trans-unit id="V2VpdGVy">
					<source>Weiter</source>
					<target>Continue</target>
				</trans-unit>
			</body>
		</file>
</xliff>

The transunit-ID should contain the base64-encoded source-string als used in the php source-code. This ID is used for matching.