sPFFramework/src/main/java/it/polimi/spf/framework/profile/ProfileTable.java
boolean removeCircleFromField(String circle, ProfileField<?> field, SPFPersona p) {
		if (field.getIdentifier().equals(ProfileField.IDENTIFIER.getIdentifier()) || field.getIdentifier().equals(ProfileField.DISPLAY_NAME.getIdentifier())) {
			return false;
		}
		SQLiteDatabase db = getWritableDatabase();
		return removeCircleFromField(circle, field, p, db);
	}
boolean removeCircleFromField(String circle, ProfileField<?> field, SPFPersona p) {
		if (field.getIdentifier().equals(ProfileField.IDENTIFIER.getIdentifier()) || field.getIdentifier().equals(ProfileField.DISPLAY_NAME.getIdentifier())) {
			return false;
		}
		SQLiteDatabase db = getWritableDatabase();
		return removeCircleFromField(circle, field, p, db);
	}
Remove a circle from a specified profile field.

@param field
the {@link ProfileField} to modify
@param circle
- the circle to add
@param p
- the {@link SPFPersona} to modify
@return true if the operation was successful