Hi Simon,
the error is popping up on the client by running oscap or foreman_scap_client, below some examples:
Client:++
CentOS release 6.7 (Final)
Linux test6.cesystems.at 2.6.32-573.3.1.el6.x86_64 #1 SMP Thu Aug 13 22:55:16 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Version 1.2.6-0.1.el6++
[root@test6 yum.repos.d]# rpm -qa | grep openscap
openscap-1.2.6-0.1.el6.x86_64
openscap-scanner-1.2.6-0.1.el6.x86_64
openscap-utils-1.2.6-0.1.el6.x86_64
[root@test6 yum.repos.d]# oscap info /var/lib/openscap/content/242bd9721153604fb704b763b4ac6aa0e24f813b5527c7a4ad323f06166aa0e8.xml
Could not determine document type
OpenSCAP Error: Start tag expected, '<' not found [oscap_source.c:230]
Entity: line 1: parser error : Start tag expected, '<' not found
prise Linux 7</ns3:platform>
^
Unable to parse XML at: '/var/lib/openscap/content/242bd9721153604fb704b763b4ac6aa0e24f813b5527c7a4ad323f06166aa0e8.xml' [oscap_source.c:232]
[root@test6 yum.repos.d]# /usr/bin/foreman_scap_client 1
DEBUG: running: oscap xccdf eval --profile xccdf_org.ssgproject.content_profile_pci-dss --results-arf /tmp/d20151007-1436-2popdy/results.xml /var/lib/openscap/content/242bd9721153604fb704b763b4ac6aa0e24f813b5527c7a4ad323f06166aa0e8.xml
OpenSCAP Error: Start tag expected, '<' not found [oscap_source.c:230]
Entity: line 1: parser error : Start tag expected, '<' not found
prise Linux 7</ns3:platform>
^
Unable to parse XML at: '/var/lib/openscap/content/242bd9721153604fb704b763b4ac6aa0e24f813b5527c7a4ad323f06166aa0e8.xml' [oscap_source.c:232]
Scan failed
Version 1.2.5-1.el6++
[root@test6 yum.repos.d]# rpm -qa | grep openscap
openscap-1.2.5-1.el6.x86_64
openscap-utils-1.2.5-1.el6.x86_64
openscap-scanner-1.2.5-1.el6.x86_64
[root@test6 yum.repos.d]# oscap info /var/lib/openscap/content/242bd9721153604fb704b763b4ac6aa0e24f813b5527c7a4ad323f06166aa0e8.xml
Document type: Source Data Stream
Imported: 2015-10-06T21:38:48
Stream: scap_org.open-scap_datastream_from_xccdf_ssg-rhel6-xccdf-1.2.xml
...
[root@test6 yum.repos.d]# /usr/bin/foreman_scap_client 1
DEBUG: running: oscap xccdf eval --profile xccdf_org.ssgproject.content_profile_pci-dss --results-arf /tmp/d20151007-54545-1pvv0yv/results.xml /var/lib/openscap/content/242bd9721153604fb704b763b4ac6aa0e24f813b5527c7a4ad323f06166aa0e8.xml
DEBUG: running: /usr/bin/bzip2 /tmp/d20151007-54545-1pvv0yv/results.xml
Uploading results to https://katello.cesystems.at:9090/compliance/arf/1