# #StackBounty: #marginpar #scrbook How to assign tagged margin notes to opposite margins of a scrbook?

### Bounty: 50

Consider the following piece of LaTeX code, saved in a file named `test.tex`. This code was copied almost verbatim from campa’s answer to a previous post of mine in which I requested to add optional tags to margin notes in order to be able to selectively hide some of the notes, but not all of them, by specifying a tag. The difference is that I used the `scrbook` document class, and added a title.

``````documentclass{scrbook}

title{A book}

makeatletter

newcommand*{newmarginstuff}[1]{%
expandafter@ifdefinablecsname @my@marg@#1endcsname
{expandafterletcsname @my@marg@#1endcsname=iftrue}%fi
}

newcommand*{includemarginstuff}[1]{%
@bsphackexpandafterletcsname @my@marg@#1endcsname=iftrue@esphack
} %fi

newcommand*{excludemarginstuff}[1]{%
@bsphackexpandafterletcsname @my@marg@#1endcsname=iffalse@esphack
} %fi

newcommand*{marginstuff}[2][]{%
ifrelaxdetokenize{#1}relax
expandafter@firstoftwo
else
expandafter@secondoftwo
fi
{marginpar{#2}}%
{csname @my@marg@#1endcsnamemarginpar{#2}fi}%
}

makeatother

newmarginstuff{foo}
newmarginstuff{baz}

begin{document}
maketitle

parskip2ex

Text text text text text text text
marginstuff[foo]{1st foo}
text text text text text text text text text
text text text text text text text text text

Text text text text text text text
marginstuff{generic}
text text text text text text text text text
text text text text text text text text text

excludemarginstuff{foo}
Text text text text text text text
marginstuff[foo]{2nd foo}
text text text text text text text text text
text text text text text text text text text

Text text text text text text text
marginstuff[baz]{1st baz}
text text text text text text text text text
text text text text text text text text text

end{document}
``````

The resulting pdf is (I use LuaLaTeX):

I’d like the margin notes carrying the tag `baz` to appear on the opposite margin to those margin notes carrying the tag `foo`. How can this be accomplished?

Note that in the `scrbook` document class, the margin notes carrying the tag `foo` appear automatically on alternating sides of consecutive pages, and I don’t want to change this behavior.

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