Anonymous blocks can be nested in the procedure and exception blocks in as many levels as you want : Introduction « PL SQL Programming « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial
1. Introduction
2. Query Select
3. Set
4. Insert Update Delete
5. Sequences
6. Table
7. Table Joins
8. View
9. Index
10. SQL Data Types
11. Character String Functions
12. Aggregate Functions
13. Date Timestamp Functions
14. Numerical Math Functions
15. Conversion Functions
16. Analytical Functions
17. Miscellaneous Functions
18. Regular Expressions Functions
19. Statistical Functions
20. Linear Regression Functions
21. PL SQL Data Types
22. PL SQL Statements
23. PL SQL Operators
24. PL SQL Programming
25. Cursor
26. Collections
27. Function Procedure Packages
28. Trigger
29. SQL PLUS Session Environment
30. System Tables Data Dictionary
31. System Packages
32. Object Oriented
33. XML
34. Large Objects
35. Transaction
36. User Privilege
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Oracle PL/SQL Tutorial » PL SQL Programming » Introduction 
24. 1. 5. Anonymous blocks can be nested in the procedure and exception blocks in as many levels as you want
<<MAIN>>
declare
    ...
     Declaration section
    ...
begin
    ...
    Procedural section
    ...
        <<SUB1>>
        declare
        ...
        begin
        ...
        end;
    ...
exception
    ...
end;

You can label all blocks including nested ones by using identifiers enclosed in << >>.

This notation allows programmers to reference elements of different blocks.

24. 1. Introduction
24. 1. 1. Writing a simple program
24. 1. 2. Each complete line of the PL/SQL code must end with a semicolon (;).
24. 1. 3. Anonymous Block Structure
24. 1. 4. An example of an anonymous block.
24. 1. 5. Anonymous blocks can be nested in the procedure and exception blocks in as many levels as you want
24. 1. 6. The Lexical Set of Elements
24. 1. 7. Delimiters
24. 1. 8. Comments
24. 1. 9. Multi-line comments start with /* and end with */.
24. 1. 10. Declaring variables
24. 1. 11. Declaring a Variable by Reference
24. 1. 12. There are some restrictions on the declaration of variables:
24. 1. 13. Assigning values to variables
24. 1. 14. Assign SQL query results to PL/SQL variables
24. 1. 15. Literals as variable values
24. 1. 16. Examples of Integer and Real Literals
24. 1. 17. Numeric literals cannot contain dollar signs or commas, but they can be written in scientific notation
24. 1. 18. Character and string literals in the Oracle world are enclosed by single quotes
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