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\documentclass{article}
\usepackage{pgfkeys}
\usepackage{pgfkeyx}
\makeatletter
\begingroup
\def\iden#1{#1}
\catcode`\/=13
\catcode`\,=13
\catcode`\==13
\iden{\endgroup
\pgfkeys{%
/ my family / .is family,
/my family/my keys/.cd,
keya / .code = \def\keyavalue{#1},
keya/.default = {keya-default},
keyb / .code = \def\myvalueb{#1},
keyb /.default=keyb-default,
.normal code=\def\x#1{#1},
keyc/.code=\pgfqkeysalso\pgfkeyscurrentpath{#1},
keyc/.value required,
keyd/.is if with no callback = true,
keye/.is if with 1 callback = {true}{\def\x##1{##1-True-#1}},
keyf/.is if with 2 callbacks =
{true}{\def\x##1{##1-True-#1}}{\def\x##1{##1-False-#1}},
}%
}
\pgfkeys{%
/my family/my keys/.cd,
keya={x},
keyb=aa,
keyc = {keya=aa, keyb=bb},
}
\pgfkeys{%
/my family/my keys/.cd,
keya/.restore default,
.restore key defaults={keya,keyb}
}
\makeatother
\begin{document}
\pgfkeys{%
/my family/my keys/keyf=true,
}
\ifkeyf
\texttt{`keyf'} is \textsf{true}.
\fi
%\show\x
\end{document}
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