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Top Forums UNIX for Beginners Questions & Answers General Purpose XML Processing Post 303026310 by bakunin on Saturday 24th of November 2018 02:46:05 AM
Old 11-24-2018
Quote:
Originally Posted by rahuldaso
what is the main difference beetween html and xml?
XML is the principle of using markup - "tags" - to denote special parts of a text put into a standardised format: tags are denoted "<tagname>", etc.. (there would be other ways of marking up text, like:

Code:
This is normal text [italic=on]but[italic=off] the last word was different.

which is also using the markup-principle but is not XML.)

HTML is one very specific variety of XML, with a fixed set of tags that can occur and a fixed order of tags that have to be there:

Code:
<body>....</body>
<head>....</head>

would be an error in HTML because the head-tag has to come before the body-tag. In XML this would be perfectly OK because there is no such rule. In fact there is no list of tags which are allowed and no prescribed structure they are allowed to have like there is in HTML.

So, in short: every HTML text is a valid XML text too, but not every XML has to be calid HTML.

I hope this helps.

bakunin
 

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IPTABLES-XML(1) 						  iptables 1.4.21						   IPTABLES-XML(1)

NAME
iptables-xml -- Convert iptables-save format to XML SYNOPSIS
iptables-xml [-c] [-v] DESCRIPTION
iptables-xml is used to convert the output of iptables-save into an easily manipulatable XML format to STDOUT. Use I/O-redirection pro- vided by your shell to write to a file. -c, --combine combine consecutive rules with the same matches but different targets. iptables does not currently support more than one target per match, so this simulates that by collecting the targets from consecutive iptables rules into one action tag, but only when the rule matches are identical. Terminating actions like RETURN, DROP, ACCEPT and QUEUE are not combined with subsequent targets. -v, --verbose Output xml comments containing the iptables line from which the XML is derived iptables-xml does a mechanistic conversion to a very expressive xml format; the only semantic considerations are for -g and -j targets in order to discriminate between <call> <goto> and <nane-of-target> as it helps xml processing scripts if they can tell the difference between a target like SNAT and another chain. Some sample output is: <iptables-rules> <table name="mangle"> <chain name="PREROUTING" policy="ACCEPT" packet-count="63436" byte-count="7137573"> <rule> <conditions> <match> <p>tcp</p> </match> <tcp> <sport>8443</sport> </tcp> </conditions> <actions> <call> <check_ip/> </call> <ACCEPT/> </actions> </rule> </chain> </table> </iptables-rules> Conversion from XML to iptables-save format may be done using the iptables.xslt script and xsltproc, or a custom program using libxsltproc or similar; in this fashion: xsltproc iptables.xslt my-iptables.xml | iptables-restore BUGS
None known as of iptables-1.3.7 release AUTHOR
Sam Liddicott <azez@ufomechanic.net> SEE ALSO
iptables-save(8), iptables-restore(8), iptables(8) iptables 1.4.21 IPTABLES-XML(1)
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