A GEM graph representing a data warehouse
288 Combi & Oliboni
Copyright ?© 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of
Idea Group Inc. is prohibited.
On April 1, 2005 a new product with code ???Y1??? and price ???$50??? is added to the catalogue
in the category SporProduct. The GEM graph after this insertion is reported
in Figure 4. The dashed region contains the new product with its properties.
In particular, the new product is represented by means of the complex node Product
with valid time interval [01/04/05,now]. The new product is related to SportProduct
by means of the edge ProdList having the same time interval. Moreover, the
new product has the simple node Code with value ???Y1??? and the simple node Price
Figure 3. Changing the price
$10
X1
$20
X2
$25
Temporal Semistructured Data Models and Data Warehouses 28
Copyright ?© 2007, Idea Group Inc.
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