The org.apache.sis.internal.jaxb.gco
package conceptually defines two complementary objects:
ObjectIdentification
and ObjectReference
. However only the later is defined by
a Java class, because the former is implicitly defined by the classes in the public API of SIS.
This page contains the information that we would have put in ObjectIdentification
Javadoc
is such class existed.
The gco:ObjectIdentification
XML attribute group is implicitly included
by all metadata types defined in the org.apache.sis.metadata.iso
packages.
The attributes of interest defined in this group are id
and uuid
.
This gco:ObjectIdentification
group is complementary to gco:ObjectReference
,
which defines the xlink
and uuidref
attributes to be supported by all metadata
wrappers in the private org.apache.sis.internal.jaxb.metadata
package and sub-packages.
gml:id
and gco:uuid
The GML identifiers page said:
id
is a standard GML attribute available on every object-with-identity.
It has type="xs:ID"
- i.e. it is a fragment identifier, unique within document scope only,
for internal cross-references. It is not useful by itself as a persistent unique identifier.uuid
is an optional attribute available on every object-with-identity, provided in
the GMD schemas that implement ISO 19115 in XML. May be used as a persistent
unique identifier, but only available within GMD context.However according the OGC schema, those identifiers seem to be defined in the GCO schema.