\documentclass[12pt,a4paper]{report}
\usepackage{ucs}
\usepackage{fontspec}
\usepackage{xunicode}
\usepackage{xltxtra}
\usepackage{polyglossia}
\usepackage{graphicx}
\usepackage{float}

\setdefaultlanguage[variant=british]{english}
\setromanfont[Mapping=tex-text, Ligatures=Common]{Linux Libertine}

\title{Title}
\author{name}

\begin{document}
\maketitle

\begin{abstract}
Here is the abstract of my article which I will make at the end of my
article, i.e.\ when I will sure about everything in my
project. Therefore I will learn how to write it well at that time and
not now.
\end{abstract}

\input{intro}

\end{document}