【计划】看Saxon把XQuery编译为语法树的这个过程，在哪里体现的。如果没有的话，要找出执行具体查询的代码段，贴到blog里面。 
private Expression parseOrExpression() throws StaticError {
Expression exp = parseAndExpression();
while (t.currentToken == Token.OR) { nextToken(); exp = new BooleanExpression(exp, Token.OR, parseAndExpression()); setLocation(exp);
} return exp;
} 
int properties = (inheritNamespaces ? 0 : ReceiverOptions.DISINHERIT_NAMESPACES); out.startElement(nameCode, typeCode, locationId, properties); // output the required namespace nodes via a callback outputNamespaceNodes(c2, out); // process subordinate instructions to generate attributes and content content.process(c2); // output the element end tag (which will fail if validation fails) out.endElement();
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