epl frame

<?xml version="1.0"?>

<!-- every(A->B) -->
<every>
	<followBy>
		<var1>
			<A/>
		</var1>
		<var2>
			<B/>
		</var2>
	</followBy>	
</every>

<!-- every A -> every B -->
<followBy>
	<var1>
		<every>
			<A/>
		</every>
	</var1>
	<var2>
		<every>
			<B/>
		</every>
	</var2>
</followBy>

<!-- every(A->B->C) -->
<every>
	<followBy>
		<var1>
			<followBy>
				<var1>
					<A/>
				</var1>
				<var2>
					<B/>
				</var2>
			</followBy>
		</var1>
		<var2>
			<B/>
		</var2>
	</followBy>
</every>


<!-- every [5]A -->
<every>
	<count>
		<var1>5</var1>
		<var2><A/></var2>
	</count>	
</every>

<!-- every A->(B and not A) -->
<followBy>
	<var1>
		<every><A/></every>
	</var1>
	<var2>
		<andnot>
			<var1>
				<B/>
			</var1>
			<var2>
				<A/>
			</var2>
		</andnot>
	</var2>
</followBy>

<!-- every a=A->b=B -->
<followBy>
	<var1>
		<every>
			<A>
				<name>a</name>
			</A>
		</every>
	</var1>
	<var2>
		<B>
			<name>b</name>
		</B>
	</var2>
</followBy>

<!-- [10:]A until B -->
<until>
	<var1>
		<count>
			<var1>10</var1>
			<var2></var2>
			<var3><A/></var3>
		</count>
	</var1>
	<var2>
		<B/>
	</var2>
</until>

<!-- A until timer:interval(10 sec) -->
<until>
	<var1>
		<every><A/></every>
	</var1>
	<var2>
		<timer>
			<interval>10000</interval>
		</timer>
	</var2>
</until>

<!-- (every A) where timer:winthin(10 sec) -->
<where>
	<var1>
		<every><A/></every>
	</var1>
	<var2>
		<timer>
			<within>10000</within>
		</timer>
	</var2>
</where>

owl的描述方式真的是极为不方便，只有从下往上的描述，从上往下描述累的一比，而且带对象的属性也这么难受。