[closed] Wie setze ich xref richtig?

\documentclass[fontsize=11pt,paper=a4,twoside] {scrbook}
\usepackage[main=ngerman,icelandic,danish]{babel}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc} 
\usepackage{blindtext}
\usepackage[annotation=false,hyperref=true,backend=biber,namefont=smallcaps,style=footnote-dw,idemfont=italic,pageref=true,idembib=true,ibidtracker=constrict,xref=false,idembibformat=dash,edbyidem=true,journalnumber=afteryear,useeditor=true,useprefix=true,editorstring=parens,edstringincitations=true,citepages=permit,urldate=long,xref=true,]{biblatex} 
\DefineBibliographyStrings{ngerman}{%
bibliography = {Literaturverzeichnis},
shorthands = {Abkürzungsverzeichnis},
urlseen = {zuletzt abgerufen am},
url = {in},
}

\DeclareFieldFormat{url}{\addcomma\space in\addcolon\space\url{#1}}%URL-Datum
\DeclareFieldFormat{urldate}{\hspace{-0.3em},\space\bibstring{urlseen}\space#1}

\renewcommand*{\bibmultinamedelim}{\addslash}% Bibliographie
\renewcommand*{\bibfinalnamedelim}{\addslash}% Bibliographie
\renewcommand*{\citemultinamedelim}{\addslash}% Zitate
\renewcommand*{\citefinalnamedelim}{\addslash}% Zitate
%Reihenfolge NAME, VORNAME bei Referenzen
\DeclareNameFormat{default}{% Vollzitate 
  \usebibmacro{name:last-first}{#1}{#3}{#5}{#7}%
  \usebibmacro{name:andothers}}

\DeclareNameFormat{labelname}{% alle anderen Zitate
  \usebibmacro{name:last-first}{#1}{#3}{#5}{#7}%
  \usebibmacro{name:andothers}}

\DeclareNameFormat{sortname}{% Bibliographie
  \iffirstinits
    {\usebibmacro{name:last-first}{#1}{#4}{#5}{#7}}
    {\usebibmacro{name:last-first}{#1}{#3}{#5}{#7}}%
  \usebibmacro{name:andothers}}

\renewcommand*{\jourvolstring}{\addcomma\space Jg\adddot\space}
 \renewcommand*{\journumstring}{\addspace}

 \renewcommand*{\sernumstring}{%
 \addcomma\space\bibstring{volume}\addspace}

 \defbibheading{primary}{\section*{Primärliteratur}}
\defbibheading{secondary}{\section*{Sekundärliteratur}}
\defbibheading{online}{\section*{Online-Anmerkungen}}
\defbibheading{bild}{\section*{Abbildungsquellen}}
\defbibheading{Sach}{\section*{Sachregister}}
\defbibheading{Personen}{\section*{Personenregister}}
\defbibheading{Quellen}{\section*{Quellenregister}}
\defbibheading{Orte}{\section*{Ortsregister}}
\defbibheading{Anhang}{\section*{Anhang}}

\bibliography{Test1}

\begin{document}
\blindtext \cite[Siehe][]{Kristjansson1998}

\addchap{Literaturverzeichnis, Register und Anhang}
\addsec*{Literatur- und Quellenverzeichnis}
\addcontentsline{toc}{section}{Primärliteratur}
\printbibliography[heading=primary,keyword=primary,notkeyword=secondary,notkeyword=online,notkeyword=Anhang,notkeyword=Personen,notkeyword=Sach]
\addcontentsline{toc}{section}{Sekundärliteratur}
\printbibliography[heading=secondary,notkeyword=primary,notkeyword=online,notkeyword=Anhang,notkeyword=Personen,notkeyword=Sach]
\addcontentsline{toc}{section}{Online-Anmerkungen}
\printbibliography[heading=online,keyword=online,notkeyword=secondary,notkeyword=primary,notkeyword=Anhang,notkeyword=Personen,notkeyword=Sach]
\addcontentsline{toc}{section}{Abbildungsquellen}
\printbibliography[heading=bild,keyword=bild,notkeyword=online,notkeyword=secondary,notkeyword=primary,notkeyword=Anhang,notkeyword=Personen,notkeyword=Sach]
\end{document}