Trying to understand getCollectionGraph

	public function getZoneFromUserLocation(){
		
		$user = $this->modx->getUser();
				
		$profile = $user->getOne('Profile');
		
		$usercountry = $profile->get('country');
		
		$criteria = $this->modx->newQuery('Countries');
		
		$criteria->where(array('abbreviation' => $usercountry));
		
		$zones = $this->modx->getCollectionGraph('Countries', '{"MarketZone": {}, }', $criteria);
		
		$criteria->prepare();
		echo '<pre>'.$criteria->toSQL().'</pre>';
					
			foreach($zones as $zone){
				
				$x = $zone->toArray();
			
				$mz = $zone->getOne('MarketZone');
				
				$y = $mz->toArray();
				
				print_r($x);
				
				print_r($y);

			}
		

		if(!$zone){
			
			return 'Could not determine user\'s zone';
			
		}
		
		return $this->output;
		
	}

<?xml version="1.0" encoding="UTF-8"?>

<model package="marketzones" baseClass="xPDOObject" platform="mysql" defaultEngine="MyISAM" version="1.1">

	<object class="Countries" table="countries" extends="xPDOSimpleObject">
		<field key="Country" dbtype="varchar" precision="50" phptype="string" null="false" />
		<field key="abbreviation" dbtype="varchar" precision="10" phptype="string" null="false" />
		<field key="zone" dbtype="int" precision="4" phptype="integer" null="false" default="0" />
		
		<aggregate alias="MarketZone" class="MarketZone" local="zone" foreign="id" cardinality="one" owner="foreign" />
		
	</object>
	
	<object class="MarketZone" table="market_zone" extends="xPDOSimpleObject">
		<field key="zone" dbtype="varchar" precision="50" phptype="string" null="false" />
		<field key="abbreviation" dbtype="varchar" precision="10" phptype="string" null="false" />
	</object>
	
</model>

$criteria->where(array('MarketZones.abbreviation' => $usercountry));

SELECT `Countries`.`id` AS `Countries_id`, `Countries`.`Country` AS `Countries_Country`,
 `Countries`.`abbreviation` AS `Countries_abbreviation`, `Countries`.`zone` AS `Countries_zone` 
FROM `modx_countries` AS `Countries` WHERE `Countries`.`abbreviation` = 'CA' 

$criteria->bindGraph('{"MarketZone": {}}');

$criteria->where(array('Countries.abbreviation' => $usercountry));

$mz = $zone->getOne('MarketZone');

$zone->MarketZone

$c = $modx->newQuery('modResource');
$c->sortby('pagetitle', 'ASC');
$c->where(
   array('resourceData.color' => 'red'),
);
$resources = $modx->getCollectionGraph('modResource', '{"resourceData":{}}', $c);

<?xml version="1.0" encoding="UTF-8"?>
<model package="extendedresource" baseClass="xPDOObject" platform="mysql" defaultEngine="MyISAM" tablePrefix="ext_" version="1.0.0">
    <!-- extend the modUser class -->
    <object class="extResource" extends="modResource">
        <composite alias="Data" local="id" class="resourceData" foreign="resourcedata_id" cardinality="one" owner="local"/>
    </object>
    <object class="resourceData" table="resource_data" extends="xPDOSimpleObject">
        <field key="resourcedata_id" dbtype="int" precision="11" phptype="integer" null="false" attributes="unsigned"/>
        <field key="name" dbtype="varchar" precision="50" phptype="string" null="true"/>
        <field key="color" dbtype="varchar" precision="50" phptype="string" null="true"/>
        <field key="breed" dbtype="varchar" precision="50" phptype="string" null="true"/>
        <field key="age" dbtype="int" precision="10" phptype="integer" null="false" default="0"/>

        <index alias="resourcedata_id" name="resourcedata_id" primary="false" unique="true" type="BTREE">
            <column key="resourcedata_id" length="" collation="A" null="false"/>
        </index>
        <aggregate alias="Resource" class="modResource" local="resourcedata_id" foreign="id" cardinality="one" owner="foreign"/>
    </object>
</model>

owner="local"

		$c = $this->modx->newQuery('hubCustomer');
		$c->bindGraph('{"Address":{}}');
		$c->where(array('`hubCustomer`.`id` IN('.implode(',', $results).')'));
		$c->sortby('`Address`.`first_name`', 'ASC');

		$collection = $this->modx->getCollectionGraph('hubCustomer', '{"Address":{}}', $c);