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Regularity: a fundamental property of declarative

  • From: "Costello, Roger L." <costello@mitre.org>
  • To: "xml-dev@lists.xml.org" <xml-dev@lists.xml.org>
  • Date: Wed, 30 Jan 2019 18:52:05 +0000

Regularity: a fundamental property of declarative

Hi Folks,

What are the properties of “declarative”?

Here’s one.

Assertion #1: A key feature of declarative data is the ability of readers (both human readers and machine readers) to recognize, at a glance, the shape/topology of the data.

Assertion #2: Regularity gives data a visible/parse-able shape and therefore regularity is a fundamental property of declarative.

Assertion #3: Declarative is superior. Always choose declarative.

Conclusion: Choose regular data over irregular data.

Below is an example of regular XML-encoded data followed by an example of irregular XML-encoded data. The first is declarative and superior. Choose the former over the latter.

Do you agree with my assertions, conclusion, and examples?

/Roger

Regular Data (declarative, preferred)


<People>
   
<Person>
       
<Name>John</Name>
       
<Residence>Massachusetts</Residence>
   
</Person>
   
<Person>
       
<Name>Sara</Name>
       
<Residence>Illinois</Residence>
   
</Person>
   
<Person>
       
<Name>Bill</Name>
       
<Residence>California</Residence>
   
</Person>
   
<Person>
       
<Name>Lisa</Name>
       
<Residence>New Mexico</Residence>
   
</Person>
</People>

Irregular Data (inferior, avoid)


<People>
   
<Massachusetts>
       
<Person>
           
<Name>John</Name>
       
</Person>
   
</Massachusetts>
   
<Person>
       
<Name>Sara</Name>
       
<Residence>Illinois</Residence>
   
</Person>
    
<Resident-of-California>
        
<Person>
           
<Name>Bill</Name>
       
</Person>
   
</ Resident-of-California>
   
<New-Mexico>
       
<Person>
           
<Name>Lisa</Name>
       
</Person>
   
</New-Mexico>
</People>

 



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