34
Carlo Combi, Sara Migliorini, Barbara Oliboni, and Alberto Belussi
(a)
(b)
t1'
t2'
.........
tj'
tj+1'
x1
y1
.........
xn
yn
t1
t2
.........
tn
tn+1
Polygon
<[x1,x2],...,[xn,yn]>
Fig. 2.9. (a) A geographical complex node and its geographical atomic property; (b) their
translation into XML
an XML element with name RelName. In particular, the relational edge is nested into
the XML element related to the complex node c i .
Translation of a Geographical Edge Between a Complex Node
and a Geographical Complex Node
We suppose to have a complex node that represents a geographical property with
name p and VT [t 1 , t 2 ) ∪ . . . ∪ [t i , t i+1 ), in the field-based model, and a geographical
complex node c j with name name c i and valid time [t
1 , t
2 ) ∪ . . . ∪ [t
i , t
i+1 ).
The geographical edge that connects the GeoField and c i nodes has label
geographical, name p , value, [t1, t2) ∪ . . . ∪ [t i , t i+1 )
Carlo Combi, Sara Migliorini, Barbara Oliboni, and Alberto Belussi
(a)
(b)
.........
.........
.........
Polygon
<[x1,x2],...,[xn,yn]>
Fig. 2.9. (a) A geographical complex node and its geographical atomic property; (b) their
translation into XML
an XML element with name RelName. In particular, the relational edge is nested into
the XML element related to the complex node c i .
Translation of a Geographical Edge Between a Complex Node
and a Geographical Complex Node
We suppose to have a complex node that represents a geographical property with
name p and VT [t 1 , t 2 ) ∪ . . . ∪ [t i , t i+1 ), in the field-based model, and a geographical
complex node c j with name name c i and valid time [t
1 , t
2 ) ∪ . . . ∪ [t
i , t
i+1 ).
The geographical edge that connects the GeoField and c i nodes has label
geographical, name p , value, [t1, t2) ∪ . . . ∪ [t i , t i+1 )