用于Web的目录服务(CSW)ISO元数据教程

本教程将展示如何将CSW模块与ISO元数据配置文件方案一起使用。它假定全新安装了Geoserver和 CSW ISO Metadata Profile module installed 。

配置

在 <data_dir>/csw 目录中，创建一个名为 MD_Metadata.properties (ISO元数据配置文件映射文件)，内容如下：

@fileIdentifier.CharacterString=prefixedName
identificationInfo.AbstractMD_Identification.citation.CI_Citation.title.CharacterString=title
identificationInfo.AbstractMD_Identification.descriptiveKeywords.MD_Keywords.keyword.CharacterString=keywords
identificationInfo.AbstractMD_Identification.abstract.CharacterString=abstract
$dateStamp.Date= if_then_else ( isNull("metadata.date") , 'Unknown', "metadata.date")
hierarchyLevel.MD_ScopeCode.@codeListValue='http://purl.org/dc/dcmitype/Dataset'
$contact.CI_ResponsibleParty.individualName.CharacterString='John Smith'

服务

Geoserver正在运行(并且正在响应 http://localhost:8080 )，通过如下查询CSW功能在Web浏览器中测试Geoserver CSW：

http://localhost:8080/geoserver/csw?service=csw&version=2.0.2&request=GetCapabilities

我们可以请求元数据记录的描述：：

http://localhost:8080/geoserver/csw?service=CSW&version=2.0.2&request=DescribeRecord&typeName=gmd:MD_Metadata

这会产生以下结果：

<?xml version="1.0" encoding="UTF-8"?>
<csw:DescribeRecordResponse xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/cat/csw/2.0.2 http://localhost:8080/geoserver/schemas/csw/2.0.2CSW-discovery.xsd">
<csw:SchemaComponent targetNamespace="http://www.opengis.net/cat/csw/2.0.2" schemaLanguage="http://www.w3.org/XML/Schema">
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:gco="http://www.isotc211.org/2005/gco" xmlns:gmd="http://www.isotc211.org/2005/gmd" targetNamespace="http://www.isotc211.org/2005/gmd" elementFormDefault="qualified" version="2012-07-13">
      <!-- ================================= Annotation ================================ -->
      <xs:annotation>
              <xs:documentation>Geographic MetaData (GMD) extensible markup language is a component of the XML Schema Implementation of Geographic Information Metadata documented in ISO/TS 19139:2007. GMD includes all the definitions of http://www.isotc211.org/2005/gmd namespace. The root document of this namespace is the file gmd.xsd. This identification.xsd schema implements the UML conceptual schema defined in A.2.2 of ISO 19115:2003. It contains the implementation of the following classes: MD_Identification, MD_BrowseGraphic, MD_DataIdentification, MD_ServiceIdentification, MD_RepresentativeFraction, MD_Usage, MD_Keywords, DS_Association, MD_AggregateInformation, MD_CharacterSetCode, MD_SpatialRepresentationTypeCode, MD_TopicCategoryCode, MD_ProgressCode, MD_KeywordTypeCode, DS_AssociationTypeCode, DS_InitiativeTypeCode, MD_ResolutionType.</xs:documentation>
      </xs:annotation>
      ...

按如下方式查询所有层：

http://localhost:8080/geoserver/csw?service=CSW&version=2.0.2&request=GetRecords&typeNames=gmd:MD_Metadata&resultType=results&elementSetName=full&outputSchema=http://www.isotc211.org/2005/gmd

按ID请求特定的层...：：

http://localhost:8080/geoserver/csw?service=CSW&version=2.0.2&request=GetRecordById&elementsetname=summary&id=CoverageInfoImpl--4a9eec43:132d48aac79:-8000&typeNames=gmd:MD_Metadata&resultType=results&elementSetName=full&outputSchema=http://www.isotc211.org/2005/gmd

...或使用筛选器按标题检索：：

http://localhost:8080/geoserver/csw?service=CSW&version=2.0.2&request=GetRecords&typeNames=gmd:MD_Metadata&resultType=results&elementSetName=full&outputSchema=http://www.isotc211.org/2005/gmd&constraint=Title=%27mosaic%27

无论哪种情况，都应返回：：

<?xml version="1.0" encoding="UTF-8"?>
<csw:GetRecordsResponse xmlns:xml="http://www.w3.org/XML/1998/namespace" xmlns="http://www.opengis.net/cat/csw/apiso/1.0" xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:gco="http://www.isotc211.org/2005/gco" xmlns:gmd="http://www.isotc211.org/2005/gmd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0.2" xsi:schemaLocation="http://www.opengis.net/cat/csw/2.0.2 http://localhost:8080/geoserver/schemas/csw/2.0.2/record.xsd">
  <csw:SearchStatus timestamp="2013-06-28T13:41:43.090Z"/>
  <csw:SearchResults numberOfRecordsMatched="1" numberOfRecordsReturned="1" nextRecord="0" recordSchema="http://www.isotc211.org/2005/gmd" elementSet="full">
    <gmd:MD_Metadata>
      <gmd:fileIdentifier>
        <gco:CharacterString>CoverageInfoImpl--4a9eec43:132d48aac79:-8000</gco:CharacterString>
      </gmd:fileIdentifier>
      <gmd:dateStamp>
        <gco:Date>Unknown</gco:Date>
      </gmd:dateStamp>
      <gmd:identificationInfo>
        <gmd:MD_DataIdentification>
          <gmd:extent>
            <gmd:EX_Extent>
              <gmd:geographicElement>
                <gmd:EX_GeographicBoundingBox crs="urn:x-ogc:def:crs:EPSG:6.11:4326">
                  <gmd:westBoundLongitude>36.492</gmd:westBoundLongitude>
                  <gmd:southBoundLatitude>6.346</gmd:southBoundLatitude>
                  <gmd:eastBoundLongitude>46.591</gmd:eastBoundLongitude>
                  <gmd:northBoundLatitude>20.83</gmd:northBoundLatitude>
                </gmd:EX_GeographicBoundingBox>
              </gmd:geographicElement>
            </gmd:EX_Extent>
          </gmd:extent>
        </gmd:MD_DataIdentification>
        <gmd:AbstractMD_Identification>
          <gmd:citation>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>mosaic</gco:CharacterString>
              </gmd:title>
            </gmd:CI_Citation>
          </gmd:citation>
          <gmd:descriptiveKeywords>
            <gmd:MD_Keywords>
              <gmd:keyword>
                <gco:CharacterString>WCS</gco:CharacterString>
              </gmd:keyword>
              <gmd:keyword>
                <gco:CharacterString>ImageMosaic</gco:CharacterString>
              </gmd:keyword>
              <gmd:keyword>
                <gco:CharacterString>mosaic</gco:CharacterString>
              </gmd:keyword>
            </gmd:MD_Keywords>
          </gmd:descriptiveKeywords>
        </gmd:AbstractMD_Identification>
      </gmd:identificationInfo>
      <gmd:contact>
        <gmd:CI_ResponsibleParty>
          <gmd:individualName>
            <gco:CharacterString>John Smith</gco:CharacterString>
          </gmd:individualName>
        </gmd:CI_ResponsibleParty>
      </gmd:contact>
      <gmd:hierarchyLevel>
        <gmd:MD_ScopeCode codeListValue="http://purl.org/dc/dcmitype/Dataset"/>
      </gmd:hierarchyLevel>
    </gmd:MD_Metadata>
  </csw:SearchResults>
</csw:GetRecordsResponse>

我们可以申请房产的域名。例如，“标题”的所有值：：

http://localhost:8080/geoserver/csw?service=csw&version=2.0.2&request=GetDomain&propertyName=Title

这应该会产生以下结果：

<?xml version="1.0" encoding="UTF-8"?>
<csw:GetDomainResponse xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dct="http://purl.org/dc/terms/" xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/cat/csw/2.0.2 http://localhost:8080/geoserver/schemas/csw/2.0.2/CSW-discovery.xsd">
  <csw:DomainValues type="csw:Record">
      <csw:PropertyName>Title</csw:PropertyName>
      <csw:ListOfValues>
        <csw:Value>A sample ArcGrid file</csw:Value>
        <csw:Value>Manhattan (NY) landmarks</csw:Value>
        <csw:Value>Manhattan (NY) points of interest</csw:Value>
        <csw:Value>Manhattan (NY) roads</csw:Value>
        <csw:Value>North America sample imagery</csw:Value>
        <csw:Value>Pk50095 is a A raster file accompanied by a spatial data file</csw:Value>
        <csw:Value>Spearfish archeological sites</csw:Value>
        <csw:Value>Spearfish bug locations</csw:Value>
        <csw:Value>Spearfish restricted areas</csw:Value>
        <csw:Value>Spearfish roads</csw:Value>
        <csw:Value>Spearfish streams</csw:Value>
        <csw:Value>Tasmania cities</csw:Value>
        <csw:Value>Tasmania roads</csw:Value>
        <csw:Value>Tasmania state boundaries</csw:Value>
        <csw:Value>Tasmania water bodies</csw:Value>
        <csw:Value>USA Population</csw:Value>
        <csw:Value>World rectangle</csw:Value>
        <csw:Value>mosaic</csw:Value>
        <csw:Value>sfdem is a Tagged Image File Format with Geographic information</csw:Value>
      </csw:ListOfValues>
  </csw:DomainValues>
</csw:GetDomainResponse>

要请求前10条以上的记录或进行更复杂的查询，可以使用带有XML查询的HTTP POST请求作为请求正文。例如，在以下请求中使用MaxRecords选项，可以返回关键字中包含“ImageMosaic”的前50个层：

http://localhost:8080/geoserver/csw

正文：：

<?xml version="1.0" encoding="UTF-8"?>
<GetRecords service="CSW" version="2.0.2" maxRecords="50" startPosition="1" resultType="results" outputFormat="application/xml" outputSchema="http://www.opengis.net/cat/csw/2.0.2" xmlns="http://www.opengis.net/cat/csw/2.0.2" xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:ogc="http://www.opengis.net/ogc" xmlns:ows="http://www.opengis.net/ows" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dct="http://purl.org/dc/terms/" xmlns:gml="http://www.opengis.net/gml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/cat/csw/2.0.2 ../../../csw/2.0.2/CSW-discovery.xsd">
  <Query typeNames="csw:Record">
    <ElementSetName typeNames="csw:Record">full</ElementSetName>
    <Constraint version="1.1.0">
      <ogc:Filter>
        <ogc:PropertyIsLike wildCard="%" singleChar="_" escapeChar="\">
          <ogc:PropertyName>dc:subject</ogc:PropertyName>
          <ogc:Literal>%ImageMosaic%</ogc:Literal>
        </ogc:PropertyIsLike>
      </ogc:Filter>
    </Constraint>
  </Query>
</GetRecords>
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