```
@Documented
@Retention(RUNTIME)
@Target({TYPE_USE,TYPE_PARAMETER})
@SubtypeOf(SignatureUnknown.class)
public @interface FieldDescriptor
```
Represents a field descriptor (JVM type format) as defined in the Java Virtual Machine Specification, section 4.3.2.
For example, in
```
  package org.checkerframework.checker.signature;
  public class SignatureChecker {
    private class Inner {}
  }
 
```
the field descriptors for the two types are Lorg/checkerframework/checker/signature/SignatureChecker; and Lorg/checkerframework/checker/signature/SignatureChecker$Inner; .
See the Checker Framework Manual:
Signature Checker

Annotation Type FieldDescriptor