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1. Retrieve data elements with Object Class Concept "C19448" (result in XML) but only if the Concept is indicates as the Primary concept. This is done using the Concept's primaryFlag indicator = "Yes".

   Code Block
   title Retrieve Data Elements
   https://cadsrapi.nci.nih.gov/cadsrapi4/GetXML?query=DataElement,DataElementConcept,ObjectClass,ConceptDerivationRule&ComponentConcept[Concept[@preferredName=C19448]][@primaryFlag=Yes]

   EXTENSION 1: Additionally, you can find all Data Elements where the concept is used either as a primary OR qualifier concept. This is accomplished by removing the last qualifier in the query. Removing this criteria in Example 1 returns 104 results instead of 88.

   Code Block
   title Extension 1
   [@primaryFlag=Yes]

2. Retrieve Data Elements with Property having the Primary Concept with the longName E-Mail Address.

   Code Block
   title Retrieve Data Elements
   https://cadsrapi.nci.nih.gov/cadsrapi4/GetXML?query=DataElement,DataElementConcept,Property,ConceptDerivationRule&ComponentConcept[Concept[@longName=E-mail%20Address]][@primaryFlag=Yes]

   EXTENSION 2:  To retrieve the next higher order "type" administered items, remove the name of the item(s) before it in the query argument list. For example, to get Data Element Concepts (DECs) with it's Property Primary Concept longName E-Mail Address, remove DataElement (the first item in the query argument list in Example 2):

   Retrieve DECs with Property Primary Concept name E-Mail Address.

   Code Block
   title Extension 2
   https://cadsrapi.nci.nih.gov/cadsrapi4/GetXML?query=DataElementConcept,Property,ConceptDerivationRule&ComponentConcept[Concept[@longName=E-mail%20Address]][@primaryFlag=Yes]

3. Retrieve Data Elements with it's Value Domain's ValueDomain having a ValueMeaning with a Primary Concept longName Blood and Blood Products (result in XML).

   Code Block
   title Retrieve Data Elements
   https://cadsrapi.nci.nih.gov/cadsrapi4/GetXML?query=DataElement,EnumeratedValueDomain,ValueDomainPermissibleValue,PermissibleValue,ValueMeaning,ConceptDerivationRule&ComponentConcept[Concept[@longName=Blood and Blood Products]][@primaryFlag=Yes]

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