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->Conflicts</TITLE
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-><A
-NAME="CDL-CONFLICTS">Conflicts</H1
-><P
->Not all settings of configuration items will lead to a
- coherent configuration; for example, the use of a timeout
- facility might require the existence of timer support, so if
- the one is required the other cannot be removed. Coherence
- is policed by means of consistency rules (in particular, the
- goal expressions that appear as CDL items
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-> attributes [see
- above]). A violation of consistency rules creates a
- <SPAN
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-><I
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->conflict</I
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->, which must be resolved in
- order to ensure a consistent configuration. Conflict
- resolution can be performed manually or with the assistance
- of the <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> tools. Conflicts come in the following
- flavors:</P
-><P
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-><LI
-><P
->An <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->unresolved</I
-></SPAN
-> conflict means that
-there is a reference to an entity that is not yet in the current
-configuration </P
-></LI
-><LI
-><P
->An <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->illegal value</I
-></SPAN
-> conflict is caused
-when a configuration item is set to a value that is not permitted
-(that is, a <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->legal_values</I
-></SPAN
-> goal expression
-is failing) </P
-></LI
-><LI
-><P
->An <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->evaluation exception</I
-></SPAN
-> conflict
-is caused when the evaluation of an expression would fail (for example,
-because of a division by zero) </P
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-><LI
-><P
->An <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->unsatisfied goal</I
-></SPAN
-> conflict is caused
-by a failing <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->requires</I
-></SPAN
-> goal expression </P
-></LI
-><LI
-><P
->A <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->bad data</I
-></SPAN
-> conflict arises only rarely,
-and corresponds to badly constructed CDL. Such a conflict can only
-be resolved by reference to the CDL writer.</P
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