It is hard to think there are bnd users that never used a macro. After all, every property in a bnd file can be used as a macro, including all the instructions. For example, you can use a very foundational instruction as -buildpath as macro.
${-buildpath}
However, few users seem to know that you can also create your own macros with parameters. For each macro invocation, there are {0} to {9} available as the arguments.
service = osgi.service;objectClass="${1}";resolution:=active
Provide-Capability: \
${service;my.wonderful.Service}, \
${service;another.wonderful.Service}
And don’t forget, you can hover over a selection in the bnd editors and then a tooltip will show you the expansion:
