I want to extend ISO19139 schema so that some existing elements have more
strict minOccurs attributes: 1 instead of 0. For example, how to change the
minOccurs of gmd:MD_DataIdentification.pointOfContact element to 1?
I used this good manual
<http://geonetwork-opensource.org/manuals/2.8.0/eng/developer/schemaPlugins/index.html>
and have thoroughlly worked through the example of creating the Marine
Community Profile
<http://geonetwork-opensource.org/manuals/2.8.0/eng/developer/schemaPlugins/index.html#example-iso19115-19139-marine-community-profile-mcp>
schema plugin
I also tried to use mcp profile
<https://github.com/geonetwork/schema-plugins/blob/master/iso19139.mcp/schema/extensions/mcpExtensions.xsd>
as a reference, and looking into others schema plugins also to find
something similar, but without any luck. All the schema plugins are only
extending - creating new elements. They do not seem to restrict any
occurrences of existing elements.
I read through the ISO19115 specs
<http://www.iso.org/iso/catalogue_detail.htm?csnumber=26020> and the main
suggestion seems to be there, that a profile should, at first try to use
existing elements and, if needed, change the usage of these more strict.
Creating new elements would be as a last resort, when really no existing ISO
element will not suffice.
I also used Google and some XML books to find the answer and spent time on
trials-and-errors.
Since pointOfContact is originally a part of AbstractMD_Identification_Type,
then should I start extending from there? Seems quite unlikely that to
change
/<xs:element name="pointOfContact"
type="gmd:CI_ResponsibleParty_PropertyType" minOccurs="0"
maxOccurs="unbounded"/> /
to
/<xs:element name="pointOfContact"
type="gmd:CI_ResponsibleParty_PropertyType" minOccurs="1"
maxOccurs="unbounded"/>/
I need to write ca 60 lines of xml...
Does anyone have any ideas on how to do it? I would be very thankful!
My GN version is 2.8.0
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I derived complexType by restriction as described here:
http://www.w3.org/TR/xmlschema-0/#DerivByRestrict
There has to exist gco:isoType attribute, so I extended the restricted
complexType with gco:isoType attribute.
Since pointOfContact is part of gmd:AbstractMD_Identification_Type I decided
to make things easier and just try to restrict something that is part of
gmd:MD_DataIdentification_Type -- I tried to set characterSet minOccurs to
1.
The result:
<xs:complexType name="RestrictedMD_DataIdentification_Type">
<xs:complexContent>
<xs:restriction base="gmd:MD_DataIdentification_Type">
<xs:sequence>
<xs:element ref="gmd:spatialRepresentationType" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="gmd:spatialResolution" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="gmd:language" maxOccurs="unbounded"/>
<xs:element ref="gmd:characterSet" minOccurs="1"
maxOccurs="unbounded"/>
<xs:element ref="gmd:topicCategory" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="gmd:environmentDescription" minOccurs="0"/>
<xs:element ref="gmd:extent" minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="gmd:supplementalInformation" minOccurs="0"/>
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<xs:element name="MD_DataIdentification"
substitutionGroup="gmd:AbstractMD_Identification"
type="bmg:MD_DataIdentification_Type"/>
<xs:complexType name="MD_DataIdentification_Type">
<xs:complexContent>
<xs:extension base="bmg:RestrictedMD_DataIdentification_Type">
<xs:sequence>
</xs:sequence>
<xs:attribute ref="gco:isoType" use="required"
fixed="gmd:MD_DataIdentification"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="MD_DataIdentification_PropertyType">
<xs:sequence minOccurs="0">
<xs:element ref="bmg:MD_DataIdentification"/>
</xs:sequence>
<xs:attributeGroup ref="gco:ObjectReference"/>
<xs:attribute ref="gco:nilReason"/>
</xs:complexType>
When importing and validating metadata to this schema in geonetwork, I got
this error: /SAXParseException : src-resolve: Cannot resolve the name
'gmd:spatialRepresentationType' to a(n) 'element declaration' component./
I could not find any solution to that.
Thanks in advance for any help!
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The solution was to make local elements global in ISO schema in the
extendable/restrictable element. This does not change the schema.
Creating local or global elements seems to be just a matter of choice and
style.
Here
<http://www.kohsuke.org/xmlschema/XMLSchemaDOsAndDONTs.html#avoid_local>
is an example how to fix this (change local elements to global) and some
reasons on why not use local elements in the first place.
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