In recent years, XML has been established as a major means for information management, and has been broadly utilized for complex data representation particularly web and multimedia data. Owing to an unparalleled increasing use of the XML standard, developing efficient techniques for comparing XML grammars/schemas becomes essential in various application domains, such as data integration and data warehousing. In this paper, we provide an overview of XML grammar similarity. We present the state of art related to XML grammar structural comparison. We discuss the features and functionalities of existing approaches, identifying their strengths and weaknesses. We consequently try to specify the characteristics of an improved grammar comparison method. Some emergent future research directions are also mentioned
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