I have the following questions regarding the JPA in Appian: * Is the J

LAZY loading as well as the inheritance are applicable in Appian; Appian uses hibernate and as long as hibernate support it then Appian will support it.

See the following example for an XSD that represents the inheritance relationship:
<?xml version="1.0" encoding="utf-8" ?>
<schema
          xmlns:scsbds="http://ebs.scsb.gov.sa/scsbds" targetNamespace="http://ebs.scsb.gov.sa/scsbds"
          elementFormDefault="qualified"
          xmlns="www.w3.org/.../XMLSchema">
          
          <complexType name="TST_HR_Loan">
                    <annotation>
                              <appinfo source="appian.jpa">
                                        @Table(name="TST_HR_Loan")
                                        @SequenceGenerator(
                                         name="TST_HR_Loan_Seq",
                                         sequenceName="TST_HR_Loan_Seq"
                                        )
                                        @Inheritance(strategy=InheritanceType.JOINED)
</appinfo>
                    </annotation>
                    <sequence>
                              <element name="id" type="long">
                                        <annotation>
                                                  <appinfo source="appian.jpa">
                                                            @Id
                                                            @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="TST_HR_Loan_Seq")
                                                  </appinfo>
                                        </annotation>
                              </element

Thanks for sharing!