lib/Element/Uri.php
public static function xmlDeserialize(Xml\Reader $reader)
    {
        return new self(
            \Sabre\Uri\resolve(
                (string) $reader->contextUri,
                $reader->readText()
            )
        );
    }
public static function xmlDeserialize(Xml\Reader $reader)
    {
        return new self(
            \Sabre\Uri\resolve(
                (string) $reader->contextUri,
                $reader->readText()
            )
        );
    }
This method is called during xml parsing.

This method is called statically, this is because in theory this method
may be used as a type of constructor, or factory method.

Often you want to return an instance of the current class, but you are
free to return other data as well.

Important note 2: You are responsible for advancing the reader to the
next element. Not doing anything will result in a never-ending loop.

If you just want to skip parsing for this element altogether, you can
just call $reader->next();

$reader->parseSubTree() will parse the entire sub-tree, and advance to
the next element.

@return mixed