Used yum utility, but error (REDHAT 5.3)

yum install elecard-xworks-3.0.24234.100528-i386-rhel.rpmLoaded plugins: rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
Setting up Install Process
Parsing package install arguments
Examining elecard-xworks-3.0.24234.100528-i386-rhel.rpm: 2:elecard-xworks-24234.100528-3.0.i386
Marking elecard-xworks-3.0.24234.100528-i386-rhel.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package elecard-xworks.i386 2:24234.100528-3.0 set to be updated
--> Processing Dependency: net-snmp for package: elecard-xworks
--> Processing Dependency: php-snmp for package: elecard-xworks
--> Processing Dependency: php-xml for package: elecard-xworks
--> Finished Dependency Resolution
2:elecard-xworks-24234.100528-3.0.i386 from elecard-xworks-3.0.24234.100528-i386-rhel.rpm has depsolving problems
--> Missing Dependency: net-snmp is needed by package 2:elecard-xworks-24234.100528-3.0.i386 (elecard-xworks-3.0.24234.100528-i386-rhel.rpm)
2:elecard-xworks-24234.100528-3.0.i386 from elecard-xworks-3.0.24234.100528-i386-rhel.rpm has depsolving problems
--> Missing Dependency: php-snmp is needed by package 2:elecard-xworks-24234.100528-3.0.i386 (elecard-xworks-3.0.24234.100528-i386-rhel.rpm)
2:elecard-xworks-24234.100528-3.0.i386 from elecard-xworks-3.0.24234.100528-i386-rhel.rpm has depsolving problems
--> Missing Dependency: php-xml is needed by package 2:elecard-xworks-24234.100528-3.0.i386 (elecard-xworks-3.0.24234.100528-i386-rhel.rpm)
Error: Missing Dependency: php-xml is needed by package 2:elecard-xworks-24234.100528-3.0.i386 (elecard-xworks-3.0.24234.100528-i386-rhel.rpm)
Error: Missing Dependency: net-snmp is needed by package 2:elecard-xworks-24234.100528-3.0.i386 (elecard-xworks-3.0.24234.100528-i386-rhel.rpm)
Error: Missing Dependency: php-snmp is needed by package 2:elecard-xworks-24234.100528-3.0.i386 (elecard-xworks-3.0.24234.100528-i386-rhel.rpm)