Created attachment 412125 [details]
Compressed example of externally referenced variable

Description of problem:
When parsing an external variable file using oval_variable_model_import(), 

Version-Release number of selected component (if applicable):
0.5.9

How reproducible:
Every time

Steps to Reproduce:

   //Import Definition Model
struct oscap_import_source *def_src = oscap_import_source_new_file("test_benchmark/2-16supported-release.xml", NULL);
struct oval_definition_model *def_model = oval_definition_model_new();
oval_definition_model_import(def_model, def_src, NULL);

   //Import Variable Model
struct oscap_import_source *var_src = oscap_import_source_new_file("test_benchmark/STIG_external_variables.xml", NULL);
struct oval_variable_model *var_model = oval_variable_model_new();
oval_variable_model_import(var_model, var_src, NULL);

  
Actual results:
Segmentation Fault

Expected results:
importing correctly

Additional info: See attached sample file.