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R XML - 将父节点和子节点组合成数据框架

我有这样的xml:

<root>
<cards>
<meeting name="Punchestown (IRE)" id="195" diffusion_course_name="PUNCHESTOWN">
      <race id="692415" perform_race_id="" perform_race_id_atr="" details_available="1" race_status_code="R">
        <time>12:25</time>
        <date>2018-01-13</date>
        <ampm>pm</ampm>
        <title>Adare Manor Opportunity Handicap Chase</title>
        <type>C</type>
        <distance>2m4f</distance>
        <group>Handicap</group>
        <tipsAllowed>1</tipsAllowed>
        <predictorAllowed>1</predictorAllowed>
        <bettingLink>1</bettingLink>
        <declaredRunners>10</declaredRunners>
        <liveCommentary>1</liveCommentary>
        <liveTab>1</liveTab>
        <raceDescription>Handicap Chase</raceDescription>
        <tvText>ATR </tvText>
      </race>
      <race id="692416" perform_race_id="" perform_race_id_atr="" details_available="1" race_status_code="R">
        <time>1:00</time>
        <date>2018-01-13</date>
        <ampm>pm</ampm>
        <title>Total Event Rental (Kildare) Novice Chase (Grade 3)</title>
        <type>C</type>
        <distance>2m4f</distance>
        <group>Grade 3</group>
        <tipsAllowed>1</tipsAllowed>
        <predictorAllowed>1</predictorAllowed>
        <bettingLink>1</bettingLink>
        <declaredRunners>7</declaredRunners>
        <liveCommentary>1</liveCommentary>
        <liveTab>1</liveTab>
        <raceDescription>Novice Chase Grade 3</raceDescription>
        <tvText>ATR </tvText>
      </race>
      <race id="692417" perform_race_id="" perform_race_id_atr="" details_available="1" race_status_code="R">
        <time>1:35</time>
        <date>2018-01-13</date>
        <ampm>pm</ampm>
        <title>Connolly's …
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xml xpath r

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