Celil, First, a little background... When you add a Calculated Representation Rule via VST, a Cartographic Representation is added to your feature class. A key part of the Cartographic Representation is two fields that are added to the attribute table. The Rule_Id field gets used to indicate which symbol (what we call a Representation Rule ) a particular feature will be drawn with. The other field, the Override field, is often hidden and is used in case you want to override the symbology for a particular feature. Unfortunately, when you delete a Calculated Representation Rule, you are only deleting the rule from VST. You are not deleting the Cartographic Representation itself. Since the Cartographic Representation remains on the feature class, you are unable to manually delete its associated fields. The easiest way to get rid of this unneeded field is to use the Drop Representation tool from ArcToolbox. This will remove the representation from the feature class and its associated fields. [ATTACH=CONFIG]34610[/ATTACH] You could also delete the representation from the Representations tab in the Feature Class Properties dialog, accessed by right-clicking the feature class in ArcCatalog. [ATTACH=CONFIG]34611[/ATTACH] I hope this information is helpful. Also, apologies for the somewhat confusing terminology. Just to clarify: Cartographic Representation: this is added to a feature class to support advanced symbology. One component of the representation is the addition of two attributes to the attribute table: one for the Rule ID and one for Override. Representation Rule: another component of a Cartographic Representation. The representation rules define individual symbols. Cartographic Representations are typically made up of several representation rules. Calculated Representation Rule: this is a VST rule that applies a representation rule (symbol) to features and adds the cartographic representation if necessary.
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Celil, Cartographic representations allow you can specify an override field that will be used for the rotation of the symbol. So, instead of having to enter a static value for the ???Angle??? in the representation rule properties, you get to use an attribute value that allows you to have a more dynamic rotation. To do this, you need to click the ???display field overrides??? button and then pick the attribute/field to use for the rotation. On the HoldingPattern_C feature class, this will likely be CartoAngle_Val. See fig1.png for an example. You can also achieve the same effect when using VST Calculated Representations to apply your symbology. After building your VST rule, make sure you set your desired override in the Explicit Override Fields column. See fig2.png for an example. Be aware that to use technique, each VST rule must apply the same representation rule to all of the features selected by the rule???s SQL statement. In other words, you have to select a representation rule from your style file to apply and cannot use the Expression option (see fig3.png). I hope this answer is helpful.
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