xsd - Difference between using ID+IDREF and direct Type in XML Schema? -


i new xsd , have question difference between following 2 schemas?

1) direct use of idref , id limit selection element within file:

<xsd:element name="policy" >   <xsd:complextype>     <xsd:sequence>       <xsd:element name="actor-def"                     type="tns:actor-def"/>                               <xsd:element name="actor-system-def"                     type="tns:actor-system-def"/>                </xsd:sequence>   </xsd:complextype> </xsd:element>  <xsd:complextype name="actor-def">   <xsd:sequence>     <xsd:element name="actor-system"                   type="tns:actor-system-type"/>   </xsd:sequence>   <xsd:attribute name="name"                   type="xsd:id"                   use="required" /> </xsd:complextype> <xsd:complextype name="actor-system-type">   <xsd:attribute name="name"                   type="xsd:idref"                   use="required" /> </xsd:complextype>  <xsd:complextype name="actor-system-def">   <xsd:attribute name="name" type="xsd:id" use="required" />   <xsd:attribute name="url" type="xsd:anyuri" use="required" /> </xsd:complextype>

2) setting type of element directly other element type:

<xsd:element name="policy">   <xsd:complextype>     <xsd:sequence>       <xsd:element name="actor-def"                     type="tns:actor-def"/>       <xsd:element name="actor-system-def"                     type="tns:actor-system-def"/>     </xsd:sequence>   </xsd:complextype> </xsd:element>  <xsd:complextype name="actor-def">   <xsd:sequence>     <xsd:element name="actor-system"                   type="tns:actor-system-def"/>   </xsd:sequence>     <xsd:attribute name="name"                     type="xsd:id"                     use="required" /> </xsd:complextype>  <xsd:complextype name="actor-system-def">   <xsd:attribute name="name"                   type="xsd:id"                   use="required" />   <xsd:attribute name="url"                   type="xsd:anyuri"                   use="required" /> </xsd:complextype>

i faced issues using first approach when combining jaxb in translated java classes , suggested in response other post using second method. however, not sure main difference between these 2 schemas , 1 right 1 application?


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