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The data model underlying the SQL is the row/column table, and the data model underlying XQuery is a tree-structured hierarchy of nodes that represent an XML document. XQuery actually uses a finer-grained tree structure than the element hierarchy of XML documents and XML Schema. These XQuery nodes are relevant for database-style queries: Element node This type of XQuery node represents an element itself. Text node This type of node represents element contents. It is a child of the corresponding element node. Attribute node This type of node represents an attribute and attribute value for an element. It is a child of the corresponding element node. Document node This is a specialized element node that represents the top, or root, level of a document.
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25:
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SQL and XML
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To navigate through an item tree and identify one or more items for processing, XQuery uses a path expression. In many ways, a path expression plays the same role for XQuery as the SQL query expression, described in 24, plays for SQL. A path expression identifies an individual node in the XQuery item tree by specifying the sequence of steps through the tree hierarchy that is needed to reach the node. XQuery path expressions come in two types: Rooted path expression A rooted path expression starts at the top (the root) of the item tree and steps down through the hierarchy to reach the target node. Within the book document in Figure 25-1, the rooted path expression /bookPart/chapter/ section/para navigates down to an individual paragraph within a section of a chapter. Relative path expression A relative path expression starts the current node of the item tree (the node where processing is currently focused) and steps up and/or down through the hierarchy to reach the target node. Within the book document in Figure 25-1, the relative path expression section/para navigates down to a specific paragraph if the current node is a chapter node. The steps within a path can specify motion downward within the node tree to child nodes that represent subelements, element contents, or element attributes. The steps can also specify upward motion to the parent of a node. With each step, you can specify a node test that must be passed to continue on the path to the target element. Table 25-3 shows some typical path expressions and the navigation path that they specify.
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Path Expression section/para /bookPart/chapter/section .. ../chapter .//para @@hdrLevel /header@hdrLevel para[3] * */para chapter[@revStatus=" draft"]
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Navigation Move down to a child section element, and down from there to a child para element. Start at the top of the hierarchy, and move down through bookPart, then chapter children, to a section child. Move up from the current node to its parent. Move up to the parent of the current node, then down to a chapter child node. Select any child para node that appears anywhere below the current node in the hierarchy. Select the hdrLevel attribute of the current node. Select the hdrLevel attribute of a child header node. Select the third child element with a para type. Select all children of the current node.
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PART VI
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Select all para grandchildren of the current node. Select all chapter children of the current node that have an attribute named status with value draft.
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TABLE 25-3
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Some Typical XQuery Path Expressions
Part VI:
SQL Today and Tomorrow
Like SQL, XQuery is a set-oriented language. It is optimized to work on an XQuery sequence, an ordered collection of zero or more items. The items themselves might be elements, attributes, or data values. XQuery operations tend to take sequences as their input and produce sequences as their output. A simple atomic data item is usually treated as if it were a one-item sequence. XQuery also resembles SQL in being a strongly typed language. The working draft of the XQuery specification is evolving to align the XQuery data types with those specified in XML Schema, which were described earlier in this chapter in the XML Schema section. Like SQL, XQuery provides constructors to build up more complex data values. XQuery differs substantially from SQL in being an expression-oriented rather than a statement-oriented language. Casually stated, everything in XQuery is an expression, which is evaluated to produce a value. Path expressions are one type of XQuery expression, and they produce a sequence of nodes as their result. Other expressions may combine literal values, function calls, arithmetic and Boolean expressions, and the typical parenthesized combinations of these to form arbitrarily complex expressions. Expressions can also combine sequences of nodes, using set operations like the union or intersection of sets, which match the corresponding SQL set operations. Named variables in XQuery are denoted by a leading dollar sign ($) in their names. For example, $orderNum, $currentOffice, and $c would be valid XQuery variable names. Variables can be used freely in XQuery expressions to combine their variables with literals and other variable values and node values. Variables receive new values through function calls, and by assignment in for or let expressions.
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