Based on https://www.etsi.org/deliver/etsi_en/319100_319199/31916201/01.01.01_60/en_31916201v010101p.pdf 4.4.3.2 signatures files may have the form: `*signatures*.xml`, which includes e.g. "edoc-signatures-S1.xml". (Some .asice files seem to have such file names) Currently no prefix seems to be allowed: https://github.com/open-eid/SiGa/blob/develop/siga-signature-service/src/main/java/ee/openeid/siga/service/signature/hashcode/HashcodeContainer.java#L166 `} else if (entryName.startsWith(SIGNATURE_FILE_PREFIX)) {`