The short answer is no, I don't think that any type of metadata is directly importable from one ETL tool to Informatica. The ETL tool vendors are not that comfortable with their market position to make it easy to convert amongst themselves. To my knowledge, no independent software providers have developed any utilities.
However, with some work, it might be possible to export from the current tool to a common format, then into Informatica. It may be possible to generate sources/targets from the original tool into a DDL or a database, then import into Informatica. There will be even less of a chance of exporting mapping logic from one tool to another.
Editor's Note: Expert Debbie Hamel also answered this question. Read her response here: http://www.searchDatabase.com/ateQuestionNResponse/0,289625,sid13_cid466063_tax288371,00.html
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