Manual do PHP
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# DomDocumentType->system_id()

(no version information, might be only in CVS)

DomDocumentType->system_id() -- Returns the system id of document type

## Descrição

class DomDocumentType {
string system_id ( void )
}

Returns the system id of the document type.

## Valores de retornado

Returns the system id of the DomDocumentType, as a string.

## Exemplos

Exemplo 1. Retrieving the system id
`<?php include("example.inc"); if (!$dom = domxml_open_mem($xmlstr)) { echo "Error while parsing the document\n"; exit; } $doctype = $dom->doctype(); echo $doctype->system_id(); ?>`
O exemplo acima irá imprimir:
    /share/sgml/Norman_Walsh/db3xml10/db3xml10.dtd

## Migrating to PHP 5

Use the systemId property of the DOMDocumentType object.

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DomDocumentType->public_id() | Acima | DomElement->get_attribute_node()