XPath如何查询下一个节点[重复]

Here is a sample of the xml File. If I have the id value of 20 which is halfway through the xml file. How do I first search that node out and second find the next (following) value.

<League>
  <Id>20</Id>
  <Name>Major League Soccer</Name>
  <Country>USA</Country>
  <Historical_Data>Partial</Historical_Data>
  <Fixtures>Yes</Fixtures>
  <Livescore>Yes</Livescore>
  <NumberOfMatches>135</NumberOfMatches>
  <LatestMatch>2013-06-16T04:00:00+02:00</LatestMatch>
</League>
<League>
  <Id>33</Id>
  <Name>Allsvenskan</Name>
  <Country>Sweden</Country>
  <Historical_Data>Partial</Historical_Data>
  <Fixtures>Yes</Fixtures>
  <Livescore>Yes</Livescore>
  <NumberOfMatches>88</NumberOfMatches>
  <LatestMatch>2013-06-15T16:00:00+02:00</LatestMatch>
</League>

</div>

Since League with id = 20 is halfway through the XML file you can do it dynamically using XPath. Here's a simple PHP code snippet:

<?php
$xml = <<<XML
<Leagues>
    <League>
        <Id>20</Id>
        <Name>Major League Soccer</Name>
        <Country>USA</Country>
        <Historical_Data>Partial</Historical_Data>
        <Fixtures>Yes</Fixtures>
        <Livescore>Yes</Livescore>
        <NumberOfMatches>135</NumberOfMatches>
        <LatestMatch>2013-06-16T04:00:00+02:00</LatestMatch>
    </League>
    <League>
        <Id>33</Id>
        <Name>Allsvenskan</Name>
        <Country>Sweden</Country>
        <Historical_Data>Partial</Historical_Data>
        <Fixtures>Yes</Fixtures>
        <Livescore>Yes</Livescore>
        <NumberOfMatches>88</NumberOfMatches>
        <LatestMatch>2013-06-15T16:00:00+02:00</LatestMatch>
    </League>
</Leagues>
XML;

$sxe = new SimpleXMLElement($xml);

// Retrieve league with Id = 20
$league20 = $sxe->xpath("//League[Id='20']");
print_r($league20);

// Retrieve league right after the one with Id = 20
$leagueAfter20 = $sxe->xpath("//League[Id='20']/following-sibling::League[1]");
print_r($leagueAfter20);

Output

Array
(
[0] => SimpleXMLElement Object
    (
        [Id] => 20
        [Name] => Major League Soccer
        [Country] => USA
        [Historical_Data] => Partial
        [Fixtures] => Yes
        [Livescore] => Yes
        [NumberOfMatches] => 135
        [LatestMatch] => 2013-06-16T04:00:00+02:00
    )
)
Array
(
[0] => SimpleXMLElement Object
    (
        [Id] => 33
        [Name] => Allsvenskan
        [Country] => Sweden
        [Historical_Data] => Partial
        [Fixtures] => Yes
        [Livescore] => Yes
        [NumberOfMatches] => 88
        [LatestMatch] => 2013-06-15T16:00:00+02:00
    )
)