Re: Difference between xmlns:aaa= and xmlns:aaa:= in a

When I create a XSD Schema file then there are namespace declaration at the top similar to

xmlns:aaa:="http://....."
xmlns:bbb="http://...."
targetNamespace="http://..."
elementFormDefault="qualified"
attributeFormDefault="qualified"
...

When do I have to write a "=" and when a ":=" ?

In XML attribute-value specifications, you always
write = and never :=.

You write := when writing assignment statements in
Algol, Pascal, and related languages. :)

If the text you quote was generated by a tool, then
either there's a bug in the tool or possibly the
input to the tool specified that the namespace prefix
to use was "aaa:" instead of the expected "aaa".
If the tool trusted its input (always a risk!),
it might write the above, meaning

which is well-formed XML and may be accepted by a
namespace-ignorant XML tool (are there any still?).
It's not namespace-well-formed, though, and any tool
that is generating XSD schema documents really ought
to be namespace-aware.

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* C. M. Sperberg-McQueen, Black Mesa Technologies LLC
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