XSN extension is found in template forms utilized by the user when operating Microsoft InfoPath. Microsoft InfoPath is a software application specialized in managing electronic forms. XSN files are designed templates which can be used in creating and developing forms that will later on be filled with information. InfoPath requires the user to define its own form according to the information that will be provided according to its usage. In other words, the .xsn file is the raw form that contains the data structure, behavior and appearance of the form.
Additionally, .xsn file may be composed of two or more supporting files to make up the template. XSF, .xsd, .xsl, .xml, and .js are samples of the files that may constitute the .xsn. XSN is the raw form of .xml file and .xml is the actual form that can be filled up, distributed, and submitted through electronic means. XML can also be printed. But without the .xsn files, the .xml files cannot be created.
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