Escaping in update XML messages

[Jens Brandt]

Hi,

I am trying to delete some documents from my index by posting XML-messages to 
the solr. The unique key for the documents in my index is their url. The XML 
messages look like this:

<delete><query>url:"http://example.com/path/file";</query></delete>

For simple urls everything works fine, but if the url contains an '&' like this:

<delete><query>url:"http://example.com/path/file?a=foo&b=bar";</query></delete>

an error occurs because the XML is not valid:

com.ctc.wstx.exc.WstxUnexpectedCharException: Unexpected character '=' (code 
61); expected a semi-colon after the reference for entity 'b'

Escaping '&' by using '&amp;' does not help, because the query

<delete><query>url:"http://example.com/path/file?a=foo&amp;b=bar";</query></delete>

does not match the url in my index.

How do I need to escape or encode the url in the XML message?

Thank you!
  Jens

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