birt have re-structured features since 2.5.0 release.
for compatibility, some obsolete features were still kept in the birt-framework(-sdk) packages.

since 2.6.0, these obsolete features could be removed from birt-framework(-sdk) packages. this includes:

com.lowagie.itext_1.5.4.v20100331-0630
org.apache.commons.codec_1.3.0.v20100331-0630
org.apache.derby.core_10.5.1.1
org.eclipse.birt.chart.runtime.source_2.6.0.v20100331-0630
org.eclipse.birt.chart.runtime_2.6.0.v20100331-0630
org.eclipse.birt.crosstab.source_2.6.0.v20100331-0630
org.eclipse.birt.crosstab_2.6.0.v20100331-0630
org.eclipse.birt.report.data.oda.jdbc.dbprofile.feature_2.6.0.v20100331-0630
org.eclipse.birt.report.data.oda.jdbc.dbprofile.sqlbuilder.feature.source_2.6.0.v20100331-0630
org.eclipse.birt.report.data.oda.jdbc.dbprofile.sqlbuilder.feature_2.6.0.v20100331-0630
org.eclipse.birt.report.designer.debug.source_2.6.0.v20100331-0630
org.eclipse.birt.report.designer.debug_2.6.0.v20100331-0630
org.eclipse.birt.report.designer.source_2.6.0.v20100331-0630
org.eclipse.birt.report.designer_2.6.0.v20100331-0630
org.eclipse.birt.report.runtime.source_2.6.0.v20100331-0630
org.eclipse.birt.report.runtime_2.6.0.v20100331-0630
org.eclipse.birt.sdk_2.6.0.v20100331-0630
org.mozilla.rhino_1.7.1.v20100331-0630
org.w3c.sac_1.3.0.v20100331-0630
fixed.
remove obsolete features from birt-framework and birt-sdk package.
verified in daily build 2.6.0.v20100406-0630. bug closed.