Hi,
the CSW record contains a number of element looking like this:
<?xml version="1.0" encoding="UTF-8"?>
<csw:Record xmlns:csw="http://www.opengis.net/cat/csw/2.0.2";
xmlns:ows="http://www.opengis.net/ows";
xmlns:dc="http://purl.org/dc/elements/1.1/";
xmlns:dct="http://purl.org/dc/terms/";>
<dc:identifier>urn:uuid:88247b56-4cbc-4df9-9860-db3f8042e357</dc:identifier>
<dc:type>http://purl.org/dc/dcmitype/Dataset</dc:type>
<dc:subject scheme="http://www.digest.org/2.1
">Physiography-Landforms</dc:subject>
<dct:spatial>FI-ES</dct:spatial>
<dct:abstract>Donec scelerisque pede ut nisl luctus accumsan. Quisque
ultrices, lorem eget feugiat fringilla, lorem dui porttitor ante, cursus
ultrices magna odio eu neque.</dct:abstract>
</csw:Record>
identifier, type, subject, spatial and abstract all have the same type,
SimpleLiteral,
which has a simple content, but that can have that scheme attribute, making
it
a complex attribute with simple content.
So far I've modelled it as a ComplexType with two attributes, scheme and
value:
TypeBuilder builder = new TypeBuilder(typeFactory);
// create the SimpleLiteral type
builder.setNamespaceURI(DC.SimpleLiteral.getNamespaceURI());
builder.name("scheme");
builder.bind(URI.class);
AttributeType schemeType = builder.attribute();
builder.setNamespaceURI(DC.SimpleLiteral.getNamespaceURI());
builder.name("value");
builder.bind(Object.class);
AttributeType valueType = builder.attribute();
builder.setNillable(true);
builder.addAttribute("scheme", schemeType);
builder.addAttribute("value", valueType);
builder.setName("SimpleLiteral");
That works data storage wise, but geotools filtering wise it has a problem,
if I want
to check if a certain simple literal has a certain value I have to use a
xpath
looking like "dc:identifier/dc:value", in particular:
NSS = new NamespaceSupport();
...
Filter f = FF.equals(FF.property("dc:identifier/dc:value", NSS),
FF.literal("urn:uuid:1ef30a8b-876d-4828-9246-c37ab4510bbd"));
This is not ideal I would like to be able to just use:
FF.property("dc:identifier", NSS)
since that's how the filters are expressed in CSW, but how do I make it
work?
Can a complex attribute have a "default" property?
Or will have I to roll out my own custom property accessor?
Cheers
Andrea
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Ing. Andrea Aime
@geowolf
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