Split specification

specification/files.txt

@@ -0,0 +1,23 @@
+File
+	code
+	title
+	deposition_date
+	classification
+	keywords
+	authors
+
+	technique
+	source_organisms
+	expression_systems
+	missing_residues
+
+	resolution
+	rvalue
+	rfree
+
+	assembly_matrices
+	unit_cell
+	space_group
+
+	models
+	model

specification/spec.txt → specification/models.txt

@@ -123,6 +123,8 @@ Atom
 
 	mass --> mass based on element
 	is_metal --> true if metal based on element
+	is_backbone --> based on atom name and het
+	is_sidechain --> based on atom name and het
 	chain --> chain above
 	model --> model above
 
@@ -136,28 +138,3 @@ Atom
 	rotate() --> rotates atom around axis
 	trim() --> trims atom coordinates
 	copy() --> creates copy of atom
-
-
-
-File
-	code
-	title
-	deposition_date
-	classification
-	keywords
-	authors
-
-	technique
-	source_organisms
-	expression_systems
-
-	resolution
-	rvalue
-	rfree
-
-	assembly_matrices
-	unit_cell
-	space_group
-
-	models
-	model

specification/querying.txt

@@ -0,0 +1,6 @@
+Methods which return structures take parameters which can filter them
+
+property=x --> Only those with poperty value x
+porperty__gt=x --> Only those where the numerical value of property is greater than x
+property__regex=x --> Only those where the string value of property matches regex
+structure__property__xyz=x --> Only those belonging to a structure whose property matches x when filtered