Enhance/Improve node selection algorithm for ValidateAndExportModel

[mpostol]

Describe problem

Now the method ValidateAndExportModel uses conditions defined in Part 5 8 Standard Objects and their Variables - it exports the selected model from an internal Address Space. It means that the node is neglected if it is not on the browse path available for an abstract client.

Describe the solution you'd like

At least all nodes imported from an external file and not selected for validation must be subject to error generation procedure.

Describe alternatives you've considered

• mark nodes as orphaned
• process all nodes aggregated by a selected model and generate an error for all orphaned nodes - a violation of rules defined in Part 5-8

List of tasks to be accomplished

• define model term
• reconsider conditions used for selection of Nodes and define the algorithm
• clarify what the the model contains 8 nodes actually means

Notes

Add any other context or screenshots about the feature request here.

A blocker for #510

[mpostol]

@jouniaro - referring to the discussion related to Naming Conventions for Nodes let me give you an update:

• I will address this topic using this issue (all commits will be interconnected to this issue).
• The document name is pointed out in the last commit.
• The work is conducted on the branch SemanticData-6.1.3
• As an introduction, I have just added a new section Address Space Concept Executive Summary - it is ready for review
• I will continue but need one or two days to finish

[mpostol]

Further documentation development has been forked to #563