Hi,
You could create a polygon from the layer extent.  Then use a spatial query to 
get the attributes from your current polylines.
Nicolas

> Le 20 déc. 2016 à 09:18, Richard McDonnell [via OSGeo.org] 
> <ml-node+s1560n5300627...@n6.nabble.com> a écrit :
> 
> Apologies, 
> I meant to change the subject, but forgot!! So here it is, with a 
> correct subject! 
> 
> I need a little help, I have being trying to create an Index for a 
> series of CAD drawings, they each have a extent bounding box, but its 
> broken into individual lines. 
> 
> I have so far succeeded in creating a shapefile for all of them, but my 
> problem is that what I have is several thousand open polylines instead 
> of box's. each polyline starts and ends in the same point, but I need 
> them to form polygons. 
> The other thing is that the attribute data be preserved. 
> Any help appreciated. 
> Regards, 
> 
> Richard. 
> 
> 
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