Editing a Context Graph Model in Spectrum Discovery

You can modify entity types and relationship labels. You can also add, modify, and delete properties for entity types and relationship labels.

You cannot modify or remove metadata elements if data loaded into a model includes the elements that you are trying to modify or remove. An error message is displayed if you try to remove entities or relationships that have data. Options to delete properities or change the data type are unavailable for entity or relationship properties with data.

This procedure describes how to edit a Context Graph model from within Spectrum Discovery.

On the Discovery menu bar, click Model.
The Logical Model tab is displayed by default.
Click the Context Graph Model tab.
Select the check box next to the Context Graph model that you want to edit.
Alternatively, you can click the name of the model and skip to step 5.
Click the Edit model button on the toolbar.
Perform any of the following activities.
When you finish editing the model, click Save.

This updates the model and navigates to the Context Graph Model tab.

Add an entity

This procedure describes how to add a standard entity to a Context Graph model.

To add an entity, drag an icon from the Entities panel to the canvas.
In the Properties panel, type the name for the entity in the Entity Name box.
For each entity property, enter the property name in the Name box, select the data type in the Type box, and click Add.
For more information, see Edit entity properties.

Edit entity properties

Note: You cannot edit properties that are currently populated with data.

Select the entity.
If necessary, click the PROPERTIES tab to expand the Properties panel.

In the Properties panel, enter the following details for the selected entity.

Field	Description
Name	Name of the property. For example, Age.
Type	Data type for the property. For example, integer. This field displays valid data types for a Context Graph entity.

Note: Properties with the same name in different entities always share the same data type. Changing the data type for a property will change the data type for that property with the same name in every other entity. If you want to create a property with a different data type, you must assign it a different name.

Click Add.

The property and its data type are displayed in the table below the entry fields.

Note: You can delete a property by clicking the Delete button

next to the property.

Add a relationship

This procedure describes how to add a relationship between a pair of standard entities.

To add a relationship between entities or from one entity to itself, do the following:

Note: An entity can have multiple relationships to other entities as well as to itself.

To add a relationship to	Do this
Add a relationship between entities	Drag from one entity to another entity.
Add a relationship to itself	Drag from an entity to itself.

This adds a relationship link pointing from the primary entity to the related entity or from and to the same entity when the relationship is to itself.

In the Properties panel, type the name for the relationship in the Relation Name box.
For each relationship property, enter the property name in the Name box, select the data type in the Type box, and click Add.

Rename a relationship

This procedure describes how to rename a relationship in a Context Graph model.

Note: You cannot rename a relationship that is currently populated with data.

To rename a relationship, enter a new Relation Name in the Properties panel.

Note: All relationships with the same name share the same properties.

New name is	Then the relationship properties
Unique	Remain the same as with the previous name but are now independent of all other relationships.
Shared by other entities	Are replaced by the properties associated with relationships that share its new name.

Add relationship properties

Click a relationship.
This selects all relationships with the same name. Adding or removing a property on one relationship adds or removes the same property for all relationships with the same name.

In the Properties panel, under Add Properties, enter the following details for the new property.

Field	Description
Name	Name of the property. For example, Date.
Type	Data type for the property. For example, DateTime. The list displays valid property types for a Context Graph relationship.

Note: Properties with the same name in different relationships always share the same data type. Changing the data type for a property will change the data type for that property with the same name in every other relationship. If you want to create a property with a different data type, you must assign it a different name.

Click Add.

The property and its data type are added to the table.

Note: You can delete a property by clicking the Delete button

next to the property.

Delete an entity or relationship

Note: You cannot delete an entity or relationship from a model that is currently populated with data.

To delete an entity or relationship from the canvas, select it and click the Delete button

on the toolbar or press the Delete key.

Any relationship links to an entity are also deleted.

Index entity properties

To index an entity property, click the Configure Indexes tab and select the Index Type for any property in the table.

Note: Properties with the same name in different entities always share the same index type. When you change this setting for a property in one entity, the change will apply for the same property in every other entity.

Index Type	Description
None	Indexing a property decreases search time for data in the corresponding field. However, you normally do not want to index a field that is rarely queried, because indexing many different fields slows performance when writing to a model.
Exact	The search results must the match the case of all characters within a search string.
Case Insensitive	The search results do not have to match the case of characters within a search string. This typically results in more matches for a search.