Ability to read & write DOCTYPE information

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Description

Apologies if I missed this in the documentation, but I couldn't find it anywhere, even when stepping through the code.

I would like to read and write DOCTYPEs, including their public ID and system ID. xml2js has the ability to at least write them with the syntax:

xml2js.Builder({
  doctype: {
    pubID: '-//Logiqx//DTD ROM Management Datafile//EN',
    sysID: 'http://www.logiqx.com/Dats/datafile.dtd',
});

Input

Here's some example XML from No-Intro:

<?xml version="1.0"?>
<!DOCTYPE datafile PUBLIC "-//Logiqx//DTD ROM Management Datafile//EN" "http://www.logiqx.com/Dats/datafile.dtd">
<datafile>
	<header>
		<name>Nintendo - Game Boy (Parent-Clone)</name>
		<description>Nintendo - Game Boy (Parent-Clone)</description>
		<version>20230729-000034</version>
		<date>20230729-000034</date>
		<author>aci68, akubi, Arctic Circle System, Aringon, baldjared, Bent, BigFred, BitLooter, buckwheat, C. V. Reynolds, chillerecke, darthcloud, DeadSkullzJr, Densetsu, DeriLoko3, ElBarto, foxe, fuzzball, Gefflon, Hiccup, hking0036, InternalLoss, Jack, jimmsu, Just001Kim, kazumi213, leekindo, Lesserkuma, Madeline, NESBrew12, NGEfreak, nnssxx, norkmetnoil577, NovaAurora, omonim2007, Powerpuff, PPLToast, Psychofox11, rarenight, relax, RetroUprising, rpg2813, sCZther, SonGoku, Tauwasser, togemet2, UnlockerPT, xNo, xprism, xuom2</author>
		<url>https://www.no-intro.org</url>
	</header>
	<game name="[BIOS] Nintendo Game Boy Boot ROM (World) (Rev 1)">
		<description>[BIOS] Nintendo Game Boy Boot ROM (World) (Rev 1)</description>
		<release name="[BIOS] Nintendo Game Boy Boot ROM (World) (Rev 1)" region="EUR"/>
		<release name="[BIOS] Nintendo Game Boy Boot ROM (World) (Rev 1)" region="JPN"/>
		<release name="[BIOS] Nintendo Game Boy Boot ROM (World) (Rev 1)" region="USA"/>
		<rom name="[BIOS] Nintendo Game Boy Boot ROM (World) (Rev 1).gb" size="256" crc="59c8598e" md5="32fbbd84168d3482956eb3c5051637f5" sha1="4ed31ec6b0b175bb109c0eb5fd3d193da823339f" status="verified"/>
	</game>
	<game name="[BIOS] Nintendo Game Boy Boot ROM (Japan) (En)" cloneof="[BIOS] Nintendo Game Boy Boot ROM (World) (Rev 1)">
		<description>[BIOS] Nintendo Game Boy Boot ROM (Japan) (En)</description>
		<rom name="[BIOS] Nintendo Game Boy Boot ROM (Japan) (En).gb" size="256" crc="c2f5cc97" md5="a8f84a0ac44da5d3f0ee19f9cea80a8c" sha1="8bd501e31921e9601788316dbd3ce9833a97bcbc" status="verified"/>
	</game>
</datafile>

Code

new XMLParser({
  attributeNamePrefix: '',
}).parse(xmlContents);

Output

See the above

expected data

See the above

Would you like to work on this issue?

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Start at the XMLParser usage shown in the issue and inspect the parser and builder entry points for how declarations are handled. Add tests using the supplied DOCTYPE example, covering public and system IDs on reading and writing; done means both values are preserved and emitted in valid DOCTYPE syntax.