The <targetRef> element has the following attributes:
hostName – A required value, which is the name of the host to create when you intall this component. The name must be unique at the time of installation and must be a valid host name. This value can include component-scoped substitution variable references.
typeName – An optional value of type systemName, which is the name of the host type to use for the associated host. The specified type must exist at the time that the component is saved. If this host type is defined by a plug-in, the name should include pluginName as a prefix, such as pluginName#typeName.
If this attribute is omitted, the value is system#crhost.