This plugin shows the layer(s) information like SRC coordinate system type, encoding, number of features, format type and if is valid.
Created by Alex Santos.
https://github.com/alxcart/FormatConsistency
http://plugins.qgis.org/plugins/FormatConsistency/
mariosmsk.wordpress.com 
What do you mean exactly by “format consistency”, may you give a definition please ?
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