Como obtenho um arquivo zip de 50 MB com um arquivo xml de 600 MB (mais de 300.000 "<" abc: ABCRecord ">") em uma tabela de dados mysql? O próprio arquivo xml possui a seguinte estrutura:

<?xml version='1.0' encoding='UTF-8'?>
<abc:ABCData xmlns:abc="http://www.abc-example.com" xmlns:xyz="http:/www.xyz-example.com">
<abc:ABCHeader>
<abc:ContentDate>2015-08-15T09:03:29.379055+00:00</abc:ContentDate>
<abc:FileContent>PUBLISHED</abc:FileContent>
<abc:RecordCount>310598</abc:RecordCount>
<abc:Extension>
  <xyz:Sources>
    <xyz:Source>
      <xyz:ABC>5967007LIEEXZX4LPK21</xyz:ABC>
      <xyz:Name>Bornheim Register Centre</xyz:Name>
      <xyz:ROCSponsorCountry>NO</xyz:ROCSponsorCountry>
      <xyz:RecordCount>398</xyz:RecordCount>
      <xyz:ContentDate>2015-08-15T05:00:02.952+02:00</xyz:ContentDate>
      <xyz:LastAttemptedDownloadDate>2015-08-15T09:00:01.885686+00:00</xyz:LastAttemptedDownloadDate>
      <xyz:LastSuccessfulDownloadDate>2015-08-15T09:00:02.555222+00:00</xyz:LastSuccessfulDownloadDate>
      <xyz:LastValidDownloadDate>2015-08-15T09:00:02.555222+00:00</xyz:LastValidDownloadDate>
     </xyz:Source>
    </xyz:Sources>
   </abc:Extension>
 </abc:ABCHeader>
<abc:ABCRecords>
 <abc:ABCRecord>
 <abc:ABC>5967007LIEEXZX4LPK21</abc:ABC>
  <abc:Entity>
    <abc:LegalName>REGISTERENHETEN I Bornheim</abc:LegalName>
    <abc:LegalAddress>
      <abc:Line1>Havnegata 48</abc:Line1>
      <abc:City>Bornheim</abc:City>
      <abc:Country>NO</abc:Country>
      <abc:PostalCode>8900</abc:PostalCode>
    </abc:LegalAddress>
    <abc:HeadquartersAddress>
      <abc:Line1>Havnegata 48</abc:Line1>
      <abc:City>Bornheim</abc:City>
      <abc:Country>NO</abc:Country>
      <abc:PostalCode>8900</abc:PostalCode>
    </abc:HeadquartersAddress>
    <abc:BusinessRegisterEntityID register="Enhetsregisteret">974757873</abc:BusinessRegisterEntityID>
    <abc:LegalForm>Organisasjonsledd</abc:LegalForm>
    <abc:EntityStatus>Active</abc:EntityStatus>
  </abc:Entity>
  <abc:Registration>
    <abc:InitialRegistrationDate>2014-06-15T12:03:33.000+02:00</abc:InitialRegistrationDate>
    <abc:LastUpdateDate>2015-06-15T20:45:32.000+02:00</abc:LastUpdateDate>
    <abc:RegistrationStatus>ISSUED</abc:RegistrationStatus>
    <abc:NextRenewalDate>2016-06-15T12:03:33.000+02:00</abc:NextRenewalDate>
    <abc:ManagingLOU>59670054IEEXZX44PK21</abc:ManagingLOU>
  </abc:Registration>
</abc:ABCRecord>
<abc:ABCRecord>
  <abc:ABC>5967007LIE45ZX4MHC90</abc:ABC>
  <abc:Entity>
    <abc:LegalName>SUNNDAL HOSTBANK</abc:LegalName>
    <abc:LegalAddress>
      <abc:Line1>Sunfsalsvegen 15</abc:Line1>
      <abc:City>SUNNDALSPRA</abc:City>
      <abc:Country>NO</abc:Country>
      <abc:PostalCode>6600</abc:PostalCode>
    </abc:LegalAddress>
    <abc:HeadquartersAddress>
      <abc:Line1>Sunndalsvegen 15</abc:Line1>
      <abc:City>SUNNDALSPRA</abc:City>
      <abc:Country>NO</abc:Country>
      <abc:PostalCode>6600</abc:PostalCode>
    </abc:HeadquartersAddress>
    <abc:BusinessRegisterEntityID register="Foretaksregisteret">9373245963</abc:BusinessRegisterEntityID>
    <abc:LegalForm>Hostbank</abc:LegalForm>
    <abc:EntityStatus>Active</abc:EntityStatus>
  </abc:Entity>
  <abc:Registration>
    <abc:InitialRegistrationDate>2014-06-26T15:01:02.000+02:00</abc:InitialRegistrationDate>
    <abc:LastUpdateDate>2015-06-27T15:02:39.000+02:00</abc:LastUpdateDate>
    <abc:RegistrationStatus>ISSUED</abc:RegistrationStatus>
    <abc:NextRenewalDate>2016-06-26T15:01:02.000+02:00</abc:NextRenewalDate>
    <abc:ManagingLOU>5967007LIEEXZX4LPK21</abc:ManagingLOU>
  </abc:Registration>
</abc:ABCRecord>
</abc:ABCRecords>
</abc:ABCData>

Como a tabela mysql precisa se parecer e como posso fazer isso? O objetivo é ter todo o conteúdo marcado com abc na tabela. Além disso, haverá um novo arquivo zip a cada dia, fornecido por meio de um link para download, e ele deve atualizar a tabela todos os dias. Os arquivos zip são nomeados após a seguinte estrutura: "20150815-XYZ-concatenated-file.zip". Uma dica passo a passo seria ótimo? Eu tentei isso:Importando arquivo XML com tags especiais e namespaces <abc: xyz> no mysql a partir de agora, mas ainda não está fazendo o trabalho!

Com base na explicação ThW abaixo, fiz o seguinte agora:

<?php

// open input
$reader = new XMLReader();
$reader->open('./xmlreader.xml');

// open output
$output = fopen('./xmlreader.csv', 'w');
fputcsv($output, ['id', 'name']);

$xmlns = [
  'a' => 'http://www.abc-example.com'
];

// prepare DOM
$dom   = new DOMDocument;
$xpath = new DOMXpath($dom);
foreach ($xmlns as $prefix => $namespaceURI) {
  $xpath->registerNamespace($prefix, $namespaceURI);
}

// look for the first record element
while (
  $reader->read() && 
  (
    $reader->localName !== 'ABCRecord' || 
    $reader->namespaceURI !== $xmlns['a']
  )
) {
  continue;
}

// while you have an record element
while ($reader->localName === 'ABCRecord') {
  if ($reader->namespaceURI === 'http://www.abc-example.com') {
    // expand record element node
    $node = $reader->expand($dom);
    // fetch data and write it to output
    fputcsv(
      $output, 
      [
        $xpath->evaluate('string(a:ABC)', $node),
        $xpath->evaluate('string(a:Entity/a:LegalName)', $node)
      ]
    );
  }

  // move to the next record sibling
  $reader->next('ABCRecord');
} 

Isso está correto ?! E onde encontro a saída ?! E como obtenho a saída no mysql. Desculpe pelas minhas perguntas de novato, é a primeira vez que faço isso ...

$dbHost = "localhost";
$dbUser = "root";
$dbPass = "password";
$dbName = "new_xml_extract";

$dbConn = mysqli_connect($dbHost, $dbUser, $dbPass, $dbName);

$delete = $dbConn->query("TRUNCATE TABLE `test_xml`");

....

$sql = "INSERT INTO `test_xml` (`.....`, `.....`)" . "VALUES ('". $dbConn->real_escape_string($.....) ."', '".$dbConn->real_escape_string($.....)."')";

$result = $dbConn->query($sql);
}