I am studying XQueryX and I have come up with an issue that does not seem to be addressed on the w3.org website for the XQueryX specification. It has to do with ordering stepExpr tags so that they are not sibling nodes. The problem I see with having sibling nodes is that they are supposed to represent a parent-child relationship in the XPath of Xquery. If a parser does not take document linearity into account, then the step expressions, because they are sibling nodes, may become jumbled and lose their order when trying to recreate an XPath. Though most parsers do take document linearity into considerations when parsing an XML document, sibling node order is not a specification that is outlined in the XML specification. If I am missing something please let me know. Thanks for your time and your consideration.