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wiki/help/format/fcsv.md

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+# Fluents Comma Separated Values file format description
+
+This is the documentation of the textual (and primary) Fluents data file format. The other way to store a dataset is as a pickled Dataset object. The main differences between these methods are:
+
+- Text based file formats are easier to read, easier to browse throgh, running commands on etc.
+- Text based files are better suited for svn.
+- Picled files are faster.
+
+## File headers
+
+Header lines must begin on the first line in the file. Header lines are of the form:
+
+```
+# keyword : value
+#keyword:value
+#      keyword    :value
+```
+
+Where an optional number of whitespace characters can be put between the different units on the line. The # sign at the start of the line is a traditional UNIX comment sign, and makes it easier for other programs to ignore those lines.