Re: How would you like a new axis? time::
Hi Mike, On Sun, Mar 14, 2010 at 7:04 PM, Michael Kay <mike@xxxxxxxxxxxx> wrote: > So how would you find a product element whose price today is less than its > price a week ago? I might, like to keep a sequence of "price" nodes for a product, instead of only one price for a product. Each price information can have an "effective" date. Therefore, I might have a schema like following: <xs:complexType name="Product"> <xs:sequence> <xs:element name="name" type="xs:string" /> <xs:element name="price" maxOccurs="unbounded"> <xs:simpleType> <xs:extension base="xs:double"> <xs:attribute name="effective" type="xs:dateTime" /> </xs:extension> </xs:simpleType> </xs:element> </xs:sequence> <xs:attribute name="ID" type="xs:string" /> </xs:complexType> <xs:element name="product" type="Product" maxOccurs="unbounded" /> If the corresponding XML instance is like following: <product ID="100"> <name>kitchen sink</name> <price effective="2010-03-07">15</price> <price effective="2010-03-14">10</price> </product> I can get the products as you suggested, as follows: //product[price[last()] lt price[last() - 1]] This technique, doesn't use the creation & modification dateTime's as I suggested initially, but this uses a custom schema. -- Regards, Mukul Gandhi
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