Sometimes a block lists its composite blocks as parts, and sometimes as properties

[avi-mak]

Hi,

This is a question on the difference between parts and properties. i want the question to be tool-agnostic, although I am using Sparx EA. And this is why I am sending the question to this forum and not to the EA forum (for the time being): I am looking for a SysML answer and not for an EA answer. (This may be just an EA quirk, but I don't think it is just a quirk.) 

Below I present two similar design patterns available from EA, the 'One level Block Hierarchy' pattern and the 'Two level Block Hierarchy' pattern. In the first pattern the top level block lists its composite blocks as parts.  However, in the second pattern the top level block lists its composite blocks as properties. (And this apparent contradiction has expressed itself in my first diagrams.) 

What's going on ? 

EA - One level Block Hierarchy - Pattern available from Model Wizard 

EA - Two level Block Hierarchy - Pattern available from Model Wizard

Thanks

Avraham

[James Towers]

Hi Avraham,

Both are valid, however EA is just inconsistent here. The SysML spec says "Part, reference, value, and constraint properties may be shown in block definition compartments with the labels "parts," "references," "values," and "constraints" respectively. Properties of any type may be shown in a "properties" compartment or in additional compartments with user-defined labels."

On 15 Jun 2020, at 02:00, avi-mak <amak...@gmail.com> wrote:

Hi,

This is a question on the difference between parts and properties. i want the question to be tool-agnostic, although I am using Sparx EA. And this is why I am sending the question to this forum and not to the EA forum (for the time being): I am looking for a SysML answer and not for an EA answer. (This may be just an EA quirk, but I don't think it is just a quirk.) 

<Two level Block Hierarchy - Pattern.png>

Below I present two similar design patterns available from EA, the 'One level Block Hierarchy' pattern and the 'Two level Block Hierarchy' pattern. In the first pattern the top level block lists its composite blocks as parts.  However, in the second pattern the top level block lists its composite blocks as properties. (And this apparent contradiction has expressed itself in my first diagrams.) 

What's going on ? 

EA - One level Block Hierarchy - Pattern available from Model Wizard 

<One level Block Hierarchy - Pattern.png>

EA - Two level Block Hierarchy - Pattern available from Model Wizard

<Two level Block Hierarchy - Pattern.png>

Thanks

Avraham

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<Two level Block Hierarchy - Pattern.png><One level Block Hierarchy - Pattern.png><Two level Block Hierarchy - Pattern.png>

[avi-mak]

Great thanks, James.
I thought I had messed up, and did not understood EA user methodology.

-avraham

On Wednesday, June 17, 2020 at 8:48:18 AM UTC+3, James Towers wrote:

Hi Avraham,

Both are valid, however EA is just inconsistent here. The SysML spec says "Part, reference, value, and constraint properties may be shown in block definition compartments with the labels "parts," "references," "values," and "constraints" respectively. Properties of any type may be shown in a "properties" compartment or in additional compartments with user-defined labels."

On 15 Jun 2020, at 02:00, avi-mak <amak...@gmail.com> wrote:

Hi,

This is a question on the difference between parts and properties. i want the question to be tool-agnostic, although I am using Sparx EA. And this is why I am sending the question to this forum and not to the EA forum (for the time being): I am looking for a SysML answer and not for an EA answer. (This may be just an EA quirk, but I don't think it is just a quirk.) 

<Two level Block Hierarchy - Pattern.png>

Below I present two similar design patterns available from EA, the 'One level Block Hierarchy' pattern and the 'Two level Block Hierarchy' pattern. In the first pattern the top level block lists its composite blocks as parts.  However, in the second pattern the top level block lists its composite blocks as properties. (And this apparent contradiction has expressed itself in my first diagrams.) 

What's going on ? 

EA - One level Block Hierarchy - Pattern available from Model Wizard 

<One level Block Hierarchy - Pattern.png>

EA - Two level Block Hierarchy - Pattern available from Model Wizard

<Two level Block Hierarchy - Pattern.png>

Thanks

Avraham

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