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The XML part of the spec could use a note that you cannot batch add Item nodes to the XML as intuitive as it feels to do so (why can't we?), each must be in its own <add> tag

For example (from the spec, good):

<xml path="dlclist.xml">
	<add append="First" xpath="/SMandatoryPacksData/Paths">
		<Item>dlcpacks:\spFirstTestMod\</Item>
	</add>
	
	<add append="Last" xpath="/SMandatoryPacksData/Paths">
		<Item>dlcpacks:\spLastTestMod\</Item>
	</add>
	
	<add append="Before" xpath="/SMandatoryPacksData/Paths/Item[.='dlcpacks:/mpheist/']">
		<Item>dlcpacks:\spBeforeHeistTest\</Item>
	</add>
	
	<add append="After" xpath="/SMandatoryPacksData/Paths/Item[.='dlcpacks:/patchday21ng/']">
		<Item>dlcpacks:\spAfter21ngTest\</Item>
	</add>
</xml>

Bad:

<xml path="dlclist.xml">
	<add append="Last" xpath="/SMandatoryPacksData/Paths">
		<Item>dlcpacks:\spFirstTestMod\</Item>
                <Item>dlcpacks:\spSecondTestMod\</Item>
		<Item>dlcpacks:\spThirdTestMod\</Item>
                <Item>dlcpacks:\spFourthTestMod\</Item>
	</add>
</xml>

This was a disappointing discovery, it really inflates the line count of the assembly file.

If you try to install a file that is not in the version of the game where we put it, then we will get an error.
You need to be able to skip such files.

We install the necessary files using the "OIV" file:

But if the path "mpheist4" and the file "dlc.rpf" do not exist, the installation will fail. I assume that this happens when trying to copy the archive "update\x64\dlcpacks\mpheist4\dlc.rpf" to the folder with mods.

I think the best solution is to add a parameter to the archive tag.

There are no such paths in my version of the game (v. 1.0.1868.0):
update\x64\dlcpacks\mpheist4\dlc.rpf
update\x64\dlcpacks\mpsecurity\dlc.rpf
update\x64\dlcpacks\mpsecurity\dlc1.rpf

But in the versions above, these paths will be present.

xpath='/CHandlingDataMgr/HandlingData/Item[@type="CHandlingData"]/handlingName[.="BUFFALO"]/../fMass'>

It should be

xpath="/CHandlingDataMgr/HandlingData/Item[@type="CHandlingData"]/handlingName[.="BUFFALO"]/../fMass">

With Double quotation marks "", not Single ''

Yesterday I put together an OIV installer (package format 2.2) for an addon car, for the life of me I could not figure out why it just didn't seem to appear in-game even with no warning that the install failed, I also seemingly could not get a mods folder install option, only a direct game files installation.

After taking another look at it today I just happened to notice I had two sets of content tags wrapping my content, OpenIV does not seem to error out or warn you if this is the case and just proceeds to install.. nothing.