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Zero values in literals omitted in .UML file [message #1773294]

Tue, 26 September 2017 08:45

Benedikt Bauer

Messages: 24
Registered: March 2017

Junior Member

A colleague of mine recently came across some unexpecetd behaviour in the .uml file that Papyrus uses to save a SyML model: If the value of a literal in an an instance slot is zero, the "value" tag in the .uml file is omitted. It looks like papyrus is assuming implicitly that a missing value tag equals a value of "0".

I was wondering whether this is a convention in the XMI standard or something Papyrus does on its own for some reason. If the latter, is it a bug or is it intended?

Steps to reproduce

Create a SysML model
Add an instance specification and an instance slot therein
Create literals of of different types (integer, real, bool...) in the instance slot. Create some with value "0" and some with a non-zero value
Save the model
Open the .uml file of the model with a text editor and search for the definition of the created literals (Compare code below).
Only literals of nonzero value contain a value="..." tag.

      <slot xmi:type="uml:Slot" xmi:id="_stN8QJnuEeeFToQU8dZboQ" definingFeature="_2Xe3kJntEeenh9hS7_Hu7Q">
        <value xmi:type="uml:LiteralReal" xmi:id="_KLexEJnvEeeFToQU8dZboQ" name="real"/>
        <value xmi:type="uml:LiteralInteger" xmi:id="_qykYAJnvEeeFToQU8dZboQ" name="int"/>
        <value xmi:type="uml:LiteralBoolean" xmi:id="_LMRqQJnwEeeFToQU8dZboQ" name="bool_false"/>
        <value xmi:type="uml:LiteralUnlimitedNatural" xmi:id="_Ri9fgJnwEeeFToQU8dZboQ" name="LiteralUnlimitedNatural"/>
        <value xmi:type="uml:LiteralBoolean" xmi:id="_wys94KKUEeejL5UD3kFAsw" name="bool_true" value="true"/>
        <value xmi:type="uml:LiteralInteger" xmi:id="_zjBJYKKUEeejL5UD3kFAsw" name="int_nonzero" value="11"/>
        <value xmi:type="uml:LiteralReal" xmi:id="_4opmcKKUEeejL5UD3kFAsw" name="real_nonzero" value="0.1"/>
        <value xmi:type="uml:LiteralUnlimitedNatural" xmi:id="_7on-kKKUEeejL5UD3kFAsw" name="LiteralUnlimitedNatural_nonzero" value="12"/>
      </slot>

I din't check for a UML model but I would expect the same outcome.

[Updated on: Tue, 26 September 2017 08:56]

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Re: Zero values in literals omitted in .UML file [message #1773298 is a reply to message #1773294]

Tue, 26 September 2017 08:54

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

This is a standard EMF behavior. The default value of a LiteralInteger is zero, so to serialize it would be bloat. Programmatically, there is an XMLResource.OPTION_KEEP_DEFAULT_CONTENT save option if you like bloat.

Regards

Ed Willink

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