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configuring Maps in bean factory -> Spring

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There is a difference between specifying key/value for Properties & Maps in bean factory XML file.

for example, in case of DI-ing the class which is a type of Properties, we use

<bean id="x" class="x.y">
<property name="someProperies">
<prop key="1"> one </prop>
<prop key="2"> two </prop>

and for Maps, we use

<bean id="x" class="x.y">

<property name="someProperies">
<value>Some value</value>


Why is there such difference in specifying properties, as they both are anyway belong to Map? can't we use any one for all Map types?
Could anyone answer me?


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