如何选择所有具有 id 属性的元素？ 谢谢
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<item-info>
<jid>APPET</jid>
<aid>2303</aid>
<ce:pii>S0195-6663(14)00474-7</ce:pii>
<ce:doi>10.1016/j.appet.2014.10.004</ce:doi>
<ce:copyright type="full-transfer" year="2014">Elsevier Ltd</ce:copyright>
<ce:copyright-line>© 2014 Elsevier Ltd. All rights reserved.</ce:copyright-line><!--<x title="Appetite"/>--><!--<x issn="0195-6663"/>--><!--<x volume="■■"/>--><!--<x coverYear="2014"/>--><!--<x type="authorsRunningHead">E.M. Forman, M.L. Butryn</x>-->
</item-info>
<ce:floats>
<ce:figure id="f0010">
<ce:label>Fig. 1<!--<x>. </x>--></ce:label>
<ce:caption id="ca0010">
<ce:simple-para id="sp0020">Conceptual model of weight gain and overweight.</ce:simple-para>
</ce:caption>
<ce:link id="ln0010" locator="appet2303-fig-0001"/>
</ce:figure>
<ce:table frame="topbot" id="t0010">
<ce:label>Table 1<!--<x> </x>--></ce:label>
<ce:caption id="ca0015">
<ce:simple-para id="sp0025">Commonalities of, and distinctions between, standard behavioral interventions and acceptance-based behavioral treatment.</ce:simple-para>
</ce:caption>
<tgroup cols="4">
<colspec colname="col1" colnum="1"/>
<colspec colname="col2" colnum="2"/>
<colspec colname="col3" colnum="3"/>
<colspec colname="col4" colnum="4"/>
<thead>
<row>
<entry>Domain</entry>
<entry>Example components common to both standard behavioral treatment and ABT</entry>
<entry>Example components unique to or more strongly emphasized in ABT</entry>
<entry>Example components unique to or more strongly emphasized in standard behavioral treatment</entry>
</row>
</thead>
<tbody>
<row>
<entry>Psychoeducation</entry>
<entry>
<ce:list id="ulist0015">
<ce:list-item id="u0040">
<ce:label>•<!--<x> </x>--></ce:label>
<ce:para id="p0190">Nutritional information and guidelines regarding calorie intake</ce:para>
</ce:list-item>
<ce:list-item id="u0045">
<ce:label>•<!--<x> </x>--></ce:label>
<ce:para id="p0195">Additional tools for meeting dietary goals, such as limiting fat intake or portion control</ce:para>
</ce:list-item>
<ce:list-item id="u0050">
<ce:label>•<!--<x> </x>--></ce:label>
<ce:para id="p0200">Guidelines for physical activity</ce:para>
</ce:list-item>
<ce:list-item id="u0055">
<ce:label>•<!--<x> </x>--></ce:label>
<ce:para id="p0205">Obesogenic environment as a challenge to weight loss</ce:para>
</ce:list-item>
</ce:list>
</entry>
<entry>
<ce:list id="ulist0020">
<ce:list-item id="u0060">
<ce:label>•<!--<x> </x>--></ce:label>
<ce:para id="p0210">Psychoeducation relating to the mind's response to fatty, salty, sweet foods and exertion</ce:para>
</ce:list-item>
<ce:list-item id="u0065">
<ce:label>•<!--<x> </x>--></ce:label>
<ce:para id="p0215">The impossibility of fully controlling internal responses</ce:para>
</ce:list-item>
</ce:list>
</entry>
通常，它是使用 XPath 完成的，例如 <xsl:apply-templates select="//*[@id]" />
*将匹配任何元素，[@id]谓词将允许仅检索具有指定"id"属性的元素。