[xsl] xsd- abstract definition

["Laura Jenkins" <xsl_list@xxxxxxxxxxx>]

hello,
forgive me this is a bit off topic.But i am sure the gurus here can help me 
out of this situation.
I have an xsd file, with one of the elements with an attribute abstract = 
"true".
and i used XML spy to generate an xml file out of it.
and the generated xml can not be validated w.r.t. it says that the problem 
is with the abstract value being set to true.
However i changed the value of abstract to false and it is perfectly a valid 
file ..
I have no clue of the XSD file because it is passed on to me by one of our 
clients.
Can anyone explain me what "abstract=true" means?

i checked up the specification and found ..the following definition
"
Element declarations for which {abstract} is true can appear in content 
models only when substitution is allowed; such declarations may not 
themselves ever be used to ·validate· element content."
This confused me more..


Can anyone help me in this regard?


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