initial commit lets start

models/variable.go

@@ -0,0 +1,10 @@
+package models
+
+import "encoding/xml"
+
+type Variable struct {
+	XMLName       xml.Name       `xml:"variable"`
+	Type          Type           `xml:"type"`
+	InitialValue  *InitialValue  `xml:"initialValue,omitempty"`
+	Documentation *Documentation `xml:"documentation,omitempty"`
+}