问如何在对其中一个元素进行值检查后返回元素值

EN

<routes>
    <drivinginstruction>
        <start>SA5 9BZ, UK</start>
        <end>CF2 5RF, UK</end>
        <time>2 hours, 12 minutes</time>
        <total_distance>429.83</total_distance>
        <step>
            <id>1</id>
            <instruction>Start out going SOUTHWEST on Unamed Road.</instruction>
            <distance>0.1</distance>
        </step> 
        <step>
            <id>2</id>
            <instruction>Turn LEFT onto Unamed Road.</instruction>
            <distance>0.2</distance>
        </step> 
        <step>
            <id>3</id>
            <instruction>Take the SECOND exit.</instruction>
            <distance>0.1</distance>
        </step> 
    </drivinginstruction>
</routes>

if (routes/drivinginstruction/step/distance[@value < 1.0]) then routes/drivinginstruction/step/(id|distance) else 0