Diapositive PPT

// class definitions

define class CustomerNat($NK) {

data name using Q1

embedded link customer

to class Customer(CK)

using Q2

anchor name;

}

...

// query definitions

define query Q1 as

select name from NATION

where nationkey=$NK;

...

define query Q2 as

select CK, name

from CUSTOMER

where nationkey=$NK;

...

Embedded XML fragment: example (cont.)

<xml_fragment id=”CustomerNat_0">

<class>CustomerNation</class>

<parameterɬ</parameter>

<data_fragment name="name">

<data_value>Algeria</data_value>

</data_fragment>

. . . .

<embedded_fragment name=”customer">

<xml_fragment id=“customer_456”>

<class>Customer</class>

<parameter</parameter>

...

<data_fragment name =“name”>

<data_value>Customer#456

</data_value>

</data_fragment> ...

</xml_fragment>

. . . .

</embedded_fragment>

</xml_fragment>

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