how to appropriately include schemalocation to reffer a xsd file

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C#

XML

i am building a xml grammar file for speech recognition so for that i created a lexicon file and added lexicon elements as follows the schema location giving me errors
1] the schema referenced from this location in your document contains error
2] the operation has timed out
the bolded line giving the error
plzzzz help


<lexicon version="1.0">
xmlns="http://www.w3.org/2005/01/pronunciation-lexicon"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.w3.org/2005/01/pronunciation-lexicon
http://www.w3.org/TR/2007/CR-pronunciation-lexicon-20071212/pls.xsd"
alphabet="x-microsoft-ups" xml:lang="en-IN">
<lexeme>