===Combining Rules===

[[selectors:start|Selector]] rules can be //combined// by placing them one after the other. By default, each rule will be applied to the items found before it - narrowing the number of selected assets. 

For example...

   Finish Oven.Internal Temperature

...would find an asset called 'Finish Oven', but only if it had a property called 'Internal Temperature'.

   @Oven.Internal Temperature

As above, this would find every asset with the type 'oven' that //also// has an 'Internal Temperature' property.

   .Internal Temperature.External Temperature

Will find only those assets that have **both** an internal and an external temperature.

   @Pump@VSD

Will find all of your pumps that **also** have Variable Speed Drives.

===Combining Rules - OR===

You can use the '+' symbol to add several selectors together. The selectors on either side of the symbol are executed individually, and the results are //added// - an item will appear if it is on either side of the plus-sign.

So while this selector...

   .Temperature - Actual.Temperature - Target

...will select any assets with **both** an actual and a target temperature, this one...

   .Temperature - Actual+.Temperature - Target

...will select any assets with **either** an actual //or// a target temperature.

===Uses===

Selectors are used in a number of ARDI addins. You can also use them yourself using the [[Selector API|Selector API]]