Description

Get the ancestors of a class specified by source and classId. The ancestors are returned as a graph of nodes and edges.

The source, which restricts the results to a particular class type, should be specified when using a MeSH identifier because some MeSH concepts exist in more than one RxClass tree. getClassGraphBySource returns only one tree. To find all trees that contain a concept, use getClassContexts.

This resource returns an array of nodes (rxclassMinConceptItem) and an array of edges (rxclassEdge) that link the nodes.

Parameters

All query parameters are case-insensitive.

Note that HTTP requires that query parameters be "URL encoded". For full information on URL encoding, please refer to IETF RFC 3986, "Uniform Resource Identifier".

Output structure

Results are available as either XML or JSON.

• The XML result has the root element rxclassdata. It is described in the XML Schema for the RxClass API; the relevant element structure is summarized below. Elements that would be empty might be left out.

• The JSON result is an object {...}, analogous to the content of the XML rxclassdata. Fields that might occur multiple times in the XML are expressed as an array. Fields that would be empty might be null or left out. Numbers are expressed as strings.

Both XML and JSON results follow the same outline:

rxclassdata

Root element in XML, or anonymous object in JSON

rxclassGraph

Collection of classes and edges

rxclassMinConceptItem (array)

Drug class

classId

Class identifier (an ID in the namespace of the class source)

className

Class name

classType

Class type (ATC1-4, CHEM, DISPOS, EPC, VA, etc.)

classUrl

Link to the class source

rxclassEdge (array)

Edge

classId1

Class1's identifier (an ID in the namespace of the class source)

rela

"isa" indicates that classId1 designates a subclass of classId2

classId2

Class2's identifier (an ID in the namespace of the class source)

See also

• getClassContexts

Example: Graph for the 'Arthritis, infectious' class (MeSH id=D001170)

XML: https://rxnav.nlm.nih.gov/REST/rxclass/classGraph?classId=D001170&source=disease

JSON: https://rxnav.nlm.nih.gov/REST/rxclass/classGraph.json?classId=D001170&source=disease

An XML result is shown below.

<rxclassdata>
    <rxclassGraph>
        <rxclassMinConceptItem>
            <classId>D001168</classId>
            <className>Arthritis</className>
            <classType>DISEASE</classType>
        </rxclassMinConceptItem>
        <rxclassMinConceptItem>
            <classId>D001170</classId>
            <className>Arthritis, Infectious</className>
            <classType>DISEASE</classType>
        </rxclassMinConceptItem>
        <rxclassMinConceptItem>
            <classId>D007239</classId>
            <className>Infections</className>
            <classType>DISEASE</classType>
        </rxclassMinConceptItem>
        <rxclassMinConceptItem>
            <classId>D007592</classId>
            <className>Joint Diseases</className>
            <classType>DISEASE</classType>
        </rxclassMinConceptItem>
        <rxclassMinConceptItem>
            <classId>D009140</classId>
            <className>Musculoskeletal Diseases</className>
            <classType>DISEASE</classType>
        </rxclassMinConceptItem>
        <rxclassMinConceptItem>
            <classId>X1</classId>
            <className>Diseases, Life Phases, Behavior Mechanisms and Physiologic States</className>
            <classType>DISEASE</classType>
        </rxclassMinConceptItem>
        <rxclassMinConceptItem>
            <classId>X3</classId>
            <className>Disease</className>
            <classType>DISEASE</classType>
        </rxclassMinConceptItem>
        <rxclassEdge>
            <classId1>D001168</classId1>
            <rela>isa</rela>
            <classId2>D007592</classId2>
        </rxclassEdge>
        <rxclassEdge>
            <classId1>D001170</classId1>
            <rela>isa</rela>
            <classId2>D001168</classId2>
        </rxclassEdge>
        <rxclassEdge>
            <classId1>D001170</classId1>
            <rela>isa</rela>
            <classId2>D007239</classId2>
        </rxclassEdge>
        <rxclassEdge>
            <classId1>D007239</classId1>
            <rela>isa</rela>
            <classId2>X3</classId2>
        </rxclassEdge>
        <rxclassEdge>
            <classId1>D007592</classId1>
            <rela>isa</rela>
            <classId2>D009140</classId2>
        </rxclassEdge>
        <rxclassEdge>
            <classId1>D009140</classId1>
            <rela>isa</rela>
            <classId2>X3</classId2>
        </rxclassEdge>
        <rxclassEdge>
            <classId1>X3</classId1>
            <rela>isa</rela>
            <classId2>X1</classId2>
        </rxclassEdge>
    </rxclassGraph>
</rxclassdata>