Chapter One: Overview of Standards-based Metadata Approaches Chapter Two: Changing Users' Needs Chapter Three: The Web 2.0 Paradigm and the Emergence of Socially-Constructed Metadata Approaches Chapter Four: The Emergence of Socially-Constructed Metadata Approaches Chapter Five: The Principle of Metadata Enriching Chapter Six: The Principle of Metadata Linking Chapter Seven: The Principle of Metadata Openness Chapter Eight: The Principle of Metadata Filtering Chapter Nine: The Emergence of a Theory of Metadata Enriching and Filtering Chapter Ten: Implications of the Emergent Theory of Metadata Enriching and Filtering Conclusion and Future Research ukryj opis