Modified coding specifications to include text about data storage classes

Specifications/Coding Specifications.md

@@ -2,18 +2,16 @@
 
 All code generated by the SNAC project will be written in one of the following languages.
 
-* PHP 7 (preferred)
-* PHP 5
+* PHP 7 
 * Java
 * XSLT
 
-
 ## Coding Style Specifications
 
 Source code must match the following style guidelines:
 
 * 4-space tabs with literal spaces
-* Maximum line-length of 100 characters
+* Maximum line-length of 140 characters
 * Variables and Class names follow standard camel casing syntax, with descriptive names
     * Class names start with upper-case letters
     * Variable and field names start with lower-clase letters
@@ -21,10 +19,14 @@ Source code must match the following style guidelines:
 * Filenames must match the name of the class defined within (exactly)
 * Directory structure must mirror the namespace structure (PHP)
 
+Data storage classes, i.e. those in the `src/snac/data` directory, must have `toArray()`, `fromArray()`, and `equals()` methods.  *Note: any update to the data fields in a data storage class must also include an update to these three methods.*
+
 ## Test-Driven Development
 
 Each class that is written should have matching and appropriate unit tests written.  For PHP code, those tests will be executed using the [PHPUnit](https://phpunit.de/index.html) unit testing framework.
 
+Data storage classes must also have tests for their `equals()` methods that test both equality and non-equality.
+
 ## Internal Documentation of Code
 
 All code will be internally-documented using [Javadoc](http://www.oracle.com/technetwork/java/javase/documentation/index-137868.html) style documentation, which has been ported to PHP as [phpdoc](http://www.phpdoc.org/docs/latest/guides/docblocks.html) and XSLT as [XSLTdoc](http://www.pnp-software.com/XSLTdoc/).  Tools to generate documentation from the code is also available for [Java](http://www.oracle.com/technetwork/java/javase/documentation/index-jsp-135444.html), [PHP](http://www.phpdoc.org/), and [XSLT](http://www.pnp-software.com/XSLTdoc/).
@@ -38,9 +40,6 @@ All code will be internally-documented using [Javadoc](http://www.oracle.com/tec
      *
      * Paragraphs describing the file
      *
-     * License:
-     * ....
-     *
      * @author Robbie Hott
      * @license http://opensource.org/licenses/BSD-3-Clause BSD 3-Clause
      * @copyright 2015 the Rector and Visitors of the University of Virginia, and the Regents of the University of California