Isomorphic and non-isomorphic element mapping for COBOL

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Table 1 and Figure 1 and Figure 2 are isomorphic structures (an XML instance document and a COBOL language structure) and both have isomorphic element mapping:
Table 1. Example 1 XML Instance of Isomorphic Structure with Isomorphic Element Mapping for COBOL
XML Instance COBOL Data Structure 
<x1>
  <x2>2</x2>
  <x3>
     <x4>4</x4>
  </x3>
</x1>


1 A,
     2 B pic 9,
     2 C,
        3 D pic 9;
Figure 1. Display 1 XML Instance of Isomorphic Structure with Isomorphic Element Mapping for COBOL
Isomorphic structure with isomorphic element mapping, example 1
Figure 2. Example 1 of XML Instance Isomorphic Structure with Isomorphic Element Mapping for COBOL
Isomorphic structure with isomorphic element mapping, example 2
Table 2 and Figure 3are two non-isomorphic structures (an XML instance document and a COBOL language structure) have isomorphic subsets and show isomorphic element mapping:
Table 2. Example 2 XML Instance of Non-Isomorphic Structure with Isomorphic Element Mapping for COBOL
XML Instance COBOL Data Structure 
<x1>
  <x2>2</x2>
  <x3>
     <x4>4</x4>
  </x3>
</x1>


1 A,
     2 B pic 9,
     2 C,
        3 D pic 9;
Figure 3. Example 2 of XML Instance Non-Isomorphic Structure with Isomorphic Element Mapping for COBOL
Non-isomorphic structures with isomorphic subsets
Table 3 and Figure 4 are two isomorphic structures (an XML instance document and a COBOL language structure) have non-isomorphic element mapping:
Table 3. Example 3 XML Instance of Isomorphic Structure with Non-Isomorphic Element Mapping for COBOL
XML Instance COBOL Data Structure 
<x1>
  <x2>2</x2>
  <x3>
     <x4>4</x4>
  </x3>
</x1>


1 A,
     2 B pic 9,
     2 C,
        3 D pic 9;
Figure 4. Example 3 of XML Instance Isomorphic Structure with Non-Isomorphic Element Mapping for COBOL
Isomorphic structure with non-isomorphic element mapping
Table 4 and Figure 5 are two non-isomorphic structures (an XML instance document and a COBOL language structure) have non-isomorphic element mapping:
Table 4. Example 4 XML Instance of Non-Isomorphic Structure with Non-Isomorphic Element Mapping for COBOL
XML Instance COBOL Data Structure 
<x1>
  <x2>2</x2>
  <x3>
     <x4>4</x4>
  </x3>
</x1>


1 A,
     2 B pic 9,
     2 C,
        3 D pic 9;
Figure 5. Example 4 of XML Instance Non-Isomorphic Structure with Non-Isomorphic Element Mapping for COBOL
Non-isomorphic structure with non-isomorphic element mapping