XML

1
XML

• XML is about interoperability between different
  data/software environments
• Discretion and representation of data
• DTD (.dtd) describes XML elements data
  dictionary
• XSL presentation and transformation

2
XML and Metadata

• Every time you start ArcCatalog, metadata is
  initially presented with the default metadata
  stylesheet.

• lt?xml version"1.0" encoding"ISO-8859-1" ?gt
• - ltmetadatagt
• - ltidinfogt
• - ltcitationgt
• - ltciteinfogt
•   ltorigingtNational Oceanic and Atmospheric
  Administration (NOAA) Coastal Services Center
  (CSC)lt/origingt
•   ltpubdategt19950101lt/pubdategt
•   lttitlegtMINERALS MANAGEMENT SERVICE ACTIVE LEASE
  SITESlt/titlegt
•   ltgeoformgtSHAPElt/geoformgt
•   ltonlinkgthttp//www.csc.noaa.govlt/onlinkgt
• - ltpubinfogt
•   ltpublishgtNational Oceanic and Atmospheric
  Administration (NOAA)lt/publishgt
•   lt/pubinfogt
•   ltftname Sync"TRUE"gtactlealt/ftnamegt
•   lt/citeinfogt
•   lt/citationgt
• - ltdescriptgt

3
XML for Metadata

• Metadata is stored as extensible markup language
  (XML)
• data in a file with the data or in a geodatabase.
  The Catalog
• uses XSL Transformations (XSLT) stylesheets to
  transform
• the XML data into a hypertext markup language
  (HTML)
• page. You can change the metadatas appearance by
• changing the current stylesheet using the
  dropdown list on
• the Metadata toolbar.
• (source ESRI Using ArcCatalog)

4
XML for Metadata

• XML data is embedded within tags that add
  meaning. For
• example, ltpricegt24lt/pricegt declares 24 to be a
  price. In XML
• terms this price is referred to as an element.
  Other elements might
• be product names, quantities, or totals. While a
  person can look
• at the XML and determine that 24 is a price,
  whats more important
• is that software can extract price elements from
  the file this
• isnt possible with the HTML file, where there is
  nothing to
• distinguish 24 from C.
• (source ESRI Using ArcCatalog)

5
Referencing metaeditor.dll
6
Creating and editing metadata

• See the webhelp article http//webhelp.esri.com/ar
  cgisdesktop/9.1/index.cfm?TopicNameCreating20and
  20updating20metadata for how to create and
  edit metadata

7
Metadata

• Data about the data
• i.e. fields, where the data came from, format,
  utilization
• Stored in xml
• Metadata created with ArcCatalog is stored as XML
  data, either in a file alongside the item, or
  within its geodatabase. In a geodatabase,
  metadata is stored in the GDB UserMetadata table
  as a BLOB of XML data (webhelp.esri.com).

8
XML uses XLST

• XML data can be displayed in a Web browser using
  eXtensible Style Language Transformations (XSLT)
  stylesheets that transform the XML data into an
  HTML page.

9
Programmatically create XML for you Metadata
(Article ID23693)

• 'Get the selected object and make sure it's a
  folder Dim pGxApp As IGxApplication Dim pGxObj
  As IGxObject Set pGxApp Application Set
  pGxObj pGxApp.SelectedObject If Not (TypeOf
  pGxObj Is IGxFolder) Then Exit Sub Dim sName As
  String Dim lCnt As Long sName
  "New_XML_Document" lCnt 1

10
'Count the number of objects in the folder whose
names begin 'with "New_XML_Document" Dim pGxCnt
As IGxObjectContainer Set pGxCnt pGxObj If
pGxCnt.HasChildren Then Dim pGxChldEn As
IEnumGxObject Dim pGxChld As IGxObject Set
pGxChldEn pGxCnt.Children On Error Resume Next
Set pGxChld pGxChldEn.Next Do While Not
pGxChld Is Nothing If Left(pGxChld.name, 16)
sName Then lCnt lCnt 1 Set pGxChld
pGxChldEn.Next Loop End If
11
If lCnt gt 1 Then sName sName "(" lCnt ")"
'Create a new GxMetadata object and give it a
file name Dim pGxFile As IGxFile Set pGxFile
New GxMetadata pGxFile.path pGxObj.FullName
"\" sName ".xml" 'Generate metadata for the
new GxObject Dim pMD As IMetadata Dim pXPS As
IXmlPropertySet Set pMD pGxFile Set pXPS
New XmlPropertySet pMD.Metadata pXPS
'Refresh the folder's contents pGxObj.Refresh
12
IMetadata interface

• implemented by the GxMetadata object and all
  other objects that support metadata (the bulk of
  GxObject types). Use this interface when you want
  to access the set of metadata associated with an
  object or you want to create new metadata for the
  object.

13
Export to KML

• an extension developed for ArcGIS 9.x by the City
  of Portland, Bureau of Planning.
• The extension allows ArcGIS users to export GIS
  data in keyhole markup language (KML) format
  for viewing in the free Google Earth data viewer.
  
• I heard about it through SHRUG list

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16
KML is XML technology

• lt?xml version"1.0" encoding"UTF-8"?gt
• ltkml xmlns"http//earth.google.com/kml/2.0"gt
• ltDocumentgt
• ltnamegtFraudByJurisJoinedlt/namegt
• ltopengt1lt/opengt
• ltdescriptiongtlt!CDATAExported from
  FraudByJurisJoined on 4/10/2007gtlt/descriptiongt
• ltStyle id"1"gt
• ltLineStylegt
• ltcolorgtFF6E6E6Elt/colorgt
• ltwidthgt0.4lt/widthgt
• lt/LineStylegt
• ltPolyStylegt
• ltoutlinegt1lt/outlinegt
• ltfillgt1lt/fillgt
• ltcolorgtFF80FFFFlt/colorgt
• lt/PolyStylegt
• lt/Stylegt
• ltStyle id"1_LABELS"gt

17
Class Project Deliverables

• Text (in .txt or .doc or .rtf file) of your code
  source
• Doc (in .doc) of your directions/manual/report
  describing what you have automated customized
  (include screenshots - use print key). If you
  were selling this product this would be the
  documentation included
• What I dont want .mxd or .mxt files
• Due by Week 16 (4/25/07) 5PM ? email it to me