package-version=${version;===;${Bundle-Version}}
log4j-version=1.2.17

Export-Package: \
 !about.html,!about_files, \
 org.apache.log4j.*;version="${log4j-version}"", \
 *.internal*;x-internal:=true;version="${package-version}", \
 *.impl*;x-internal:=true;version="${package-version}", \
 *;version="${package-version}"

Import-Package: \
 org.slf4j.*;version="${range;[===,=+);${package-version}}", \
 *;resolution:=optional