Quirky behavior when importing components from multiple namespaces

[Richard Martell <rm...@galdosinc.com>]

Hi,


Perhaps someone can shed some light concerning what appears to be quirky
parser behavior. I have four schemas in three namespaces as shown below,
where the alpha character denotes a schema and the digit denotes the target
namespace; the arrows show dependencies ('imp' or 'inc').

A1.xsd --imp--> B2.xsd --inc--> C2.xsd --imp--> D3.xsd


When attempting to validate a.xml against A1.xsd, Xerces 2.0.1 generates
this SAXException (concerning components from the target namespace for
D3.xsd at the end of the chain):

** Parsing error, line 50, uri null
    src-resolve.4: Components from namespace 'http://www.w3.org/1999/xlink' 
are not
    referenceable from schema document 'null'.


Now in order to get this to work, I must add two (seemingly redundant)
import statements to locate components from D3.xsd:

A1.xsd --imp--> B2.xsd --inc--> C2.xsd --imp--> D3.xsd
  |                |                               ^
  |                +--- imp -----------------------|
  +----- imp --------------------------------------+


Why is this?


- richard


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