Hi
We have just been testing the new GeoJSON output format for our complex
app-schema services, which is really great and will allow us to plug in our
data directly to web apps.
However we have noticed what is possibly a strange bug where if there are
multiple gml:ReferenceTypes in a complex type and one of them is an unbounded
reference. A snippet from our mapping file:
<AttributeMapping>
<targetAttribute>gsmlbh:indexData/gsmlbh:BoreholeDetails/gsmlbh:purpose</targetAttribute>
<ClientProperty>
<name>xlink:href</name>
<value>purpose_href</value>
</ClientProperty>
<ClientProperty>
<name>xlink:title</name>
<value>purpose_title</value>
</ClientProperty>
</AttributeMapping>
<AttributeMapping>
<targetAttribute>gsmlbh:indexData/gsmlbh:BoreholeDetails/gsmlbh:startPoint</targetAttribute>
<ClientProperty>
<name>xlink:href</name>
<value>startpoint_href</value>
</ClientProperty>
<ClientProperty>
<name>xlink:title</name>
<value>startpoint_title</value>
</ClientProperty>
</AttributeMapping>
<AttributeMapping>
<targetAttribute>gsmlbh:indexData/gsmlbh:BoreholeDetails/gsmlbh:inclinationType</targetAttribute>
<targetAttributeNode>gml:ReferenceType</targetAttributeNode>
<ClientProperty>
<name>xlink:href</name>
<value>inclinationtype_href</value>
</ClientProperty>
<ClientProperty>
<name>xlink:title</name>
<value>inclinationtype_title</value>
</ClientProperty>
</AttributeMapping>
This produces the following GeoJSON output:
*
purpose:
[
*
{
*
href:
"http://resource.geoscience.gov.au/classifier/ga/boreholepurpose/stratigraphic_investigation";
},
*
{
*
title: "stratigraphic investigation"
},
*
{
*
href: "http://resource.geoscience.gov.au/classifier/ga/locationtype/onshore";
},
*
{
*
title: "onshore"
},
*
{
*
href: "http://resource.geoscience.gov.au/classifier/ga/inclinationtype/vertical";
},
*
{
*
title: "vertical"
}
]
We don't get inclinationType or startPoint, these are instead populated into an
array of purpose.
I suspect the reason is that the gsmlbh:purpose element is an unbounded
reference type, while the other two don't. So the GeoJSON encoder picks up the
attribute mappings and populates gsmlbh:purpose with any gml:ReferenceType it
finds in the mapping file
Relevant code in the XSD:
<element name="startPoint" type="gml:ReferenceType" nillable="true"
minOccurs="0">
<annotation>
<documentation>The property startPoint:BoreholeStartPointCode provides a
term from a controlled vocabulary indicating the named position relative to
ground surface where the borehole commenced. (e.g., natural ground surface,
open pit floor, underground, offshore)</documentation>
<appinfo>
<targetElement
xmlns="http://www.opengis.net/gml/3.2";>gsmlbh:BoreholeStartPointCode</targetElement>
<targetCodeList
xmlns="http://www.opengis.net/gml/3.3/exr";>BoreholeStartPointCode</targetCodeList>
</appinfo>
</annotation>
</element>
<element name="inclinationType" type="gml:ReferenceType" nillable="true"
minOccurs="0">
<annotation>
<documentation>The property inclinationType:BoreholeInclinationCode
contains a term from a controlled vocabulary indicating the inclination type of
the borehole. Appropriate terms would include vertical; inclined up; inclined
down, horizontal.</documentation>
<appinfo>
<targetElement
xmlns="http://www.opengis.net/gml/3.2";>gsmlbh:BoreholeInclinationCode</targetElement>
<targetCodeList
xmlns="http://www.opengis.net/gml/3.3/exr";>BoreholeInclinationCode</targetCodeList>
</appinfo>
</annotation>
</element>
<element name="boreholeMaterialCustodian"
type="cit:CI_Responsibility_PropertyType" nillable="true" minOccurs="0"
maxOccurs="unbounded">
<annotation>
<documentation>The property boreholeMaterialCustodian is an association
between BoreholeDetails and a CIT:CI_ResponsibleParty describing the
organisation that is custodian of the drilled material recovered from the
borehole.</documentation>
</annotation>
</element>
<element name="purpose" type="gml:ReferenceType" nillable="true" minOccurs="0"
maxOccurs="unbounded">
<annotation>
<documentation>The property purpose:BoreholePurposeCode contains a term
from a controlled vocabulary describing the purpose for which the borehole was
drilled. e.g., site investigation, mineral exploration, hydrocarbon
exploration, water resources.</documentation>
<appinfo>
<targetElement
xmlns="http://www.opengis.net/gml/3.2";>gsmlbh:BoreholePurposeCode</targetElement>
<targetCodeList
xmlns="http://www.opengis.net/gml/3.3/exr";>BoreholePurposeCode</targetCodeList>
</appinfo>
</annotation>
</element>
http://schemas.opengis.net/gsml/4.1/borehole.xsd
schemas.opengis.net<http://schemas.opengis.net/gsml/4.1/borehole.xsd>
schemas.opengis.net
The GeoSciML Borehole package contains an information model for boreholes and
related artefacts. This is primarily through re-use of standard components from
the Observations and Measurements (ISO19156).
If I remove the maxOccurs="unbounded" from gsmlbh:purpose, I don't get the
duplication.
Thanks
Michael Sexton
Resources Division Information Services | Resources Division
t +61 2 6249 9262 www.ga.gov.au<http://www.ga.gov.au/>
[cid:[email protected]]<http://www.ga.gov.au/>
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