Today I wanted to modify some of
biblatex's bibliography driver macros (in my special case it was the
url+urldate macro). My plan was to copy the macro from the
biblatex package of my
TeX distribution to my document preamble and modify it. My first way went straight to the
standard.bbx file where the default bibliography style is defined.
Unfortunately I had to find out that not all of the macros that are called via the
\usebibmacro command are defined in the
standard.bbx. As the
standard.bbx is something like the base style that
biblatex relies on, I could also find no hint that some other style file is required or relied on, where those macros could be defined.
Therefore my questions: Where are those commands defined, that are used in the
.bbx files, if they are not defined neither in the
.bbx itself nor in the
standard.bbx? Is there a simple way to find out, where those macros are defined?
I tried some of the solutions from How to find out where a macro is defined? but those don't seem to work for