Line 432, Column 95: cannot generate system identifier for general entity "volume"

…yer.swf?url=../../data/video/lion.flv&volume=100" title="Lion"><img src="squel…

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An entity reference was found in the document, but there is no reference by that name defined. Often this is caused by misspelling the reference name, unencoded ampersands, or by leaving off the trailing semicolon (;). The most common cause of this error is unencoded ampersands in URLs
Traduco la parte rilevante in grassetto: la causa piu' comune di questo errore e' un carattere '&' non correttamente codificato.
Negli URL il carattere & va scritto cosi':
codice:
& amp;
senza lo spazio tra & e amp;