Made Partition_ID element optional in DiskPartitionObjectType
Made DNS_Entry element optional in DNSCacheEntryType
Made QName element optional in DNSQuestionType
Made Depth element optional in EPJumpCodeType
Made Message_Body element optional in HTTPMessageType
Made Domain_Name element optional in HostFieldType
Made Name element optional in LinuxPackageObjectType
Made Product and Vendor elements optional under ProductObjectType
Made IP_Address element optional under IPInfoType
Made Delegation element optional under KerberosType
Made Bitmask and Service elements optional under KerberosDelegationType
Made Size_In_Bytes element optional under StreamObjectType
Made Netname element optional under WinddowsNetworkShareObjectType
Made VolumeItem and DeviceItem elements optional under VolumeType
Merge pull request #187 from CybOXProject/issue_174

Reviewed required elements