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

log4j-version=${version;===;1.2.16}
log4j2-version=${version;==;2.0}
jboss-logmanager-version=${version;===;1.5.2}
slf4j-version=${version;===;1.7.2}

log4j-range=${range;[===,+);${log4j-version}}
log4j2-range=${range;[==,+);${log4j2-version}}
jboss-logmanager-range=${range;[===,+);${jboss-logmanager-version}}
slf4j-range=${range;[===,+);${slf4j-version}}

Export-Package: \
 !about.html,!about_files, \
 *;version="${package-version}"

Import-Package: \
 org.apache.log4j.*;resolution:=optional;version="${log4j-range}", \
 org.apache.logging.log4j.*;resolution:=optional;version="${log4j2-range}", \
 org.slf4j.*;resolution:=optional;version="${slf4j-range}", \
 org.jboss.logmanager;resolution:=optional;version="${jboss-logmanager-range}", \
 *;resolution:=optional