Schema Location Strategy

[Nestel, Frank]

Hi,

I just realized I do not understand the Schema location strategy
used by Xalan 1.4.0:

I have a document which contains elements located in two namespaces:
"" and "http://www.spieleck.de/fdpd"; with a start like

        <?xml version="1.0" encoding="ISO-8859-1"?>
        <!DOCTYPE f:fdpd [
        <!ENTITY nbsp   "&#160;">
        <!ENTITY copy   "&#x00A9;">
        <!ENTITY auml   "&#x00E4;"> <!-- LATIN SMALL LETTER A WITH DIAERESIS
-->
        <!ENTITY Auml   "&#x00C4;"> <!-- LATIN CAPITAL LETTER A WITH
DIAERESIS -->
        <!ENTITY ouml   "&#x00F6;"> <!-- LATIN SMALL LETTER O WITH DIAERESIS
-->
        <!ENTITY Ouml   "&#x00D6;"> <!-- LATIN CAPITAL LETTER O WITH
DIAERESIS -->
        <!ENTITY szlig  "&#x00DF;"> <!-- LATIN SMALL LETTER SHARP S -->
        <!ENTITY uuml   "&#x00FC;"> <!-- LATIN SMALL LETTER U WITH DIAERESIS
-->
        <!ENTITY Uuml   "&#x00DC;"> <!-- LATIN CAPITAL LETTER U WITH
DIAERESIS -->
        ]>
        <f:fdpd version="1.0"
            xmlns:f="http://www.spieleck.de/fdpd";
            xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' 
            xsi:schemaLocation='http://www.spieleck.de/fdpd fdpd.xsd'
            >

The document shall be validated against a schema located in the same local
filesystem in a file named "fdpd.xsd"

Now, if I augment the initial element to 

        <f:fdpd version="1.0"
            xmlns:f="http://www.spieleck.de/fdpd";
            xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' 
            xsi:schemaLocation='http://www.spieleck.de/fdpd fdpd.xsd'
            >

Now using an validating instance of Xerces I get the error

        http://www.spieleck.de/fdpd grammar not found

Same happens if I use

        <f:fdpd version="1.0"
            xmlns:f="http://www.spieleck.de/fdpd";
            xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' 
            xsi:noNamespaceSchemaLocation='fdpd.xsd'
            >

If I change first element to 

        <f:fdpd version="1.0"
            xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' 
            xsi:schemaLocation='http://www.spieleck.de/fdpd fdpd.xsd'
            >

I get no message about missing grammar file, but of course I havent
declared my namespace and all is wrong. Especially I do not think Xerces
is reading the fdpd.xsd file since when I render it syntactical wrong,
I do not get any error message about the schema.

I am very confused right now :-(

Thank you,
Frank


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