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 biblatex's bibmacros.
url+urldate(like some other bibmacros) is located inbiblatex.def. – lockstep Mar 27 '13 at 22:27