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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Scripting and XML
> Date: Sat, 18 Oct 1997 23:50:08 -0400 ()
> From: Rasmus Lerdorf <rasmus@l...>
> Subject: Re: Scripting and XML
> So, a typical bit of code would look like:
>
> <?php
> $result=mysql("db","select passwd from users where id='$cookie'");
> if(mysql_result($result,"passwd")==crypt($input)) {
> echo "Welcome $id<BR>\n";
> }
> ?>
What makes me nervous about the above code is that it is kind of
self modifying code. The script replaces itself with it's own output,
which may insert tags ("<br>"). So the document's structure may
change after processing the PI, and it may no longer satisfy the DTD
after that.
> I would
> like people to be able to create XML with an XML authoring tool that
> includes my PHP script tags.
That is ok for the authoring tools, but does say nothing about the
validity of XML documents that containined PHP/FI PI after delivery.
And what about XLinks ? Pointing at a document containing e.g. a
table of data created by querying a DB with PHP/FI is impossible.
You would only be able to point at a created element, if your server
is aware if it was the output of PIs. This collides with the "just in
time" translation of PHP/FI PIs, as the DB may have changed in
between.
So PHP/FI could parse correctly before, but probably not
after delivery. A possible solution is to batch-process your
documents and validate after that, but before you put them online.
++im
--
Ingo Macherius // L'Aigler Platz 4 // D-38678 Clausthal-Zellerfeld
mailto:Ingo.Macherius@t... http://www.tu-clausthal.de/~inim/
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