Changes made between version 1.0 (May, 2001) and version 1.1 (July, 2001)

• Forward:    Addition of related documentation
• Sec. 3.0:    Correction made to numerical error around #28
• Sec. 3.0:    "topic" removed from "Topic or Field of Study" for both elements in sec. 3.0
• Sec. 3.0:    "Keywords" element added to section
• Sec. 4.0:    Cost of model element, changed definition to specify if free and made manditory
• Sec. 6.1:    Modification of min. spatial resolution and addition of max. spatial resolution
• Sec. 6.2:    Construct units changes to conditional based on "Is the construct represented by units of measure?"
• Sec. 8.1:    Output modeling construct description made conditional based on "Does the output entity consist of more then one construct?"
• Sec. 8.1.1: Additional element added: "Output Construct Optionality" indicating the optionality of the construct described in sec. 8.1.1
• Sec. 9.0:    Additional Element added: "Strengths and weaknesses" an optional free text element requesting the modeler's view of the strengths or weaknesses of the model

Changes made between version 1.1 (July, 2001) and version 1.2 (October, 2001)

• Forward: In the introductory information, under "Properties of Data Elements," under "Maximum Occurance" the word "repeating" replaced with "repeatable."
• Sec. 6.1: Change in definition of element 101, 102
• Sec. 7.0: Element 126, 127 shortname corrected
• Sec. 8.0: Element 133 shortname corrected
• Sec. 8.0: Rearangement of section 8.0
• Sec. 8.0: Change in obligation to "output Representation"
• Sec. 8.1.1: Change in obligation to element 146
• Sec. 9.1: Change in short name to element 160 to match with short name of element 159
• Code Lists: Added "Research" into Code list 1