New XML DTD Extension Method (cont’d)

• Extension DTDs must declare all elements and attributes in a separate namespace

<!ELEMENT VendorCo:NodeGeography (

VendorCo:latitude, VendorCo:longitude,

VendorCo:elevation?

)>

<!ATTLIST VendorCo:NodeGeography

xmlns CDATA #IMPLIED

xmlns:VendorCo CDATA #IMPLIED

VendorCo:node-ident CDATA #REQUIRED

>

<!ELEMENT VendorCo:latitude (#PCDATA)>

<!ELEMENT VendorCo:longitude (#PCDATA)>

<!ELEMENT VendorCo:elevation (#PCDATA)>

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