in src/main/java/org/apache/sling/installer/factories/subsystems/base/impl/SubsystemBaseTransformer.java [148:160]
private List<String> parseManifestHeader(Attributes attrs, String key) {
List<String> res = new ArrayList<>();
String val = attrs.getValue(key);
if (val == null)
return Collections.emptyList();
for (String r : val.split("[|]")) {
if (r.length() > 0)
res.add(r);
}
return res;
}