The name of the component. If a field, the name must specify the parent object,
for example Account.FirstName. The __c suffix must be appended to custom object
names and custom field names when you are setting the fullName. For example,
a custom field in a custom object could have a fullName of MyCustomObject__c.MyCustomField__c.
To reference a component in a package, prepend the package’s namespace prefix to the
component name in the fullName field. Use the following syntax: namespacePrefix__ComponentName.
For example, for the custom field component MyCustomObject__c.MyCustomField__c
and the namespace MyNS, the full name is MyNS__MyCustomObject__c.MyCustomField__c.
A namespace prefix is a 1-character to 15-character alphanumeric identifier that distinguishes your package and its contents from other publishers’ packages. For more information, see "Register a Namespace" in Salesforce Help.
This is the base class for all metadata types. You cannot edit this object. A component is an instance of a metadata type.
Metadata is analogous to sObject, which represents all standard objects. Metadata represents all components and fields in Metadata API. Instead of identifying each component with an ID, each custom object or custom field has a unique fullName, which must be distinct from standard object names, as it must be when you create custom objects or custom fields in the Salesforce user interface.