Apache Ant TasksConditionConditionDescriptionSets a property if a certain condition holds true - this is ageneralization of Available and Uptodate. If the condition holds true, the property value is set to true bydefault; otherwise, the property is not set. You can set the value tosomething other than the default by specifying the valueattribute. Conditions are specified as nested elements,you must specify exactly one condition. Parameters | Attribute | Description | Required | | property | The name of the property to set. | Yes | | value | The value to set the property to. Defaults to "true". | No | | else | The value to set the property to if the condition evaluates to false. By default the property will remain unset. Since Apache Ant 1.6.3 | No | Parameters specified as nested elementsAll conditions to test are specified as nested elements, for acomplete list see here. Examples <condition property="javamail.complete"> <and> <available classname="javax.activation.DataHandler"/> <available classname="javax.mail.Transport"/> </and> </condition> sets the property javamail.complete if both theJavaBeans Activation Framework and JavaMail are available in theclasspath. <condition property="isMacOsButNotMacOsX"> <and> <os family="mac"/> <not> <os family="unix"/> </not> </and> </condition> sets the property isMacOsButNotMacOsX if the currentoperating system is MacOS, but not MacOS X - which Ant considers to bein the Unix family as well. <condition property="isSunOSonSparc"> <os name="SunOS" arch="sparc"/> </condition> sets the property isSunOSonSparc if the currentoperating system is SunOS and if it is running on a sparc architecture. | 
