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XPath Interfaces → Processor Interface - basic XPath processor interface that any XPath processor is supposed to … conform to. CompProcessor Interface - extended XPath processor that adds an ability to use XPath … Oracle virtual machine interface. Compiler Interface - XPath compiler into binary representation
XPath rewrite → evaluation is that it much more expensive than XPath rewrite, and does not scale across large numbers … referred to as XPath rewrite. See Chapter 8, \"XPath Rewrite for Structured Storage\". The advantage … of XPath rewrite is that it lets Oracle XML DB evaluate XPath-based SQL functions and methods
XPath expression - → Any XPath expression. The XPath 2.0 standard is a subset of XQuery. FLWOR expression - The most
XPath rewrite → is a subset of XML query rewrite that involves rewriting queries that involve XPath expressions … . XPath rewrite includes XMLIndex optimizations, streaming evaluation of binary XML, and rewrite to
XPath rewrite → Unstructured storage - XMLIndex indexes can be used to evaluate XPath expressions for unstructured … functional evaluation. In the absence of such an index, Oracle XML DB evaluates the XPath expression … resolves the XPath programmatically using the methods provided by the DOM API. If the operation … is completed. Binary XML storage
XPath Processor Usage Example → ); Create an XPath processor. xptproc = XmlXPathCreateCtx(xctx, NULL, node, 0, NULL); Parse the XPath … expression. exp = XmlXPathParse (xptproc, xpathexpr, &err); Evaluate the XPath expression. obj
XPath and Oracle XML → and update XML content stored in Oracle Database. They use the W3C XPath Recommendation to identify … the required node or nodes. Each node in an XML document can be uniquely identified by an XPath … expression. An XPath expression consists of a slash-separated list of element names, attributes names, and … XPath
XPath → The open standard syntax for addressing elements within a document used by XSL and XPointer. XPath
XPath → XML Path Language (XPath), based on a W3C recommendation, is a language for addressing parts of an
Overview of XPath Function ora:contains → XPath function ora:contains can be used in an XPath expression inside an XQuery expression or in a … search with a full-text predicate. It extends XPath through a standard mechanism: it is a user-defined … . When used in an XQuery expression, the XQuery return type is xs:integer(). When used in an XPath … expression
Automatic Rewriting of XQuery and XPath Expressions → use XQuery or XPath expressions to traverse the XML structure and identify the nodes on which to … operate. The ability to embed XQuery and XPath expressions in SQL statements greatly simplifies XML … Supported by Oracle XML DB\" Automatic Rewriting of XQuery and XPath Expressions SQL/XML functions … and XMLType methods use XQuery
Overview of XPath Rewrite for Structured Storage → Oracle XML DB can often optimize queries that use XPath expressions — for example, queries … involving SQL functions such as XMLQuery, XMLTable, XMLExists, and updateXML, which take XPath (XQuery … ) expressions as arguments. The XPath expression is, in effect, evaluated against the XML document without … ever constructing the
Sample of XPath Expressions that Are Rewritten → The XPath expressions that can be rewritten by Oracle XML DB are a proper subset of those that are … supported by Oracle XML DB. Whenever you can do so without losing functionality, use XPath … expressions that can be rewritten. XPath rewrite can occur in these contexts (or combinations thereof): When … XML schema-based tables.
28 Using the XPath Processor for C++ → This chapter contains these topics: XPath Interfaces Sample Programs Note: Use the new unified C
8 XPath Rewrite for Structured Storage → This chapter explains the fundamentals of XPath rewrite for structured (object-relational) storage … in Oracle XML DB. It details the rewriting of XPath-expression arguments to various SQL functions … . This chapter contains these topics: Overview of XPath Rewrite for Structured Storage Sample of XPath … Expressions
Searching XML Documents using XPath Expressions → The XPath language is a W3C Recommendation for navigating XML documents. It is a subset of the … XQuery language, in the sense that an XPath expression is also an XQuery expression. XPath models an XML … predicates and node-test functions. Applying an XPath expression to an XML document can result in a set … element
Table 4-1 Common XPath Constructs → XPath Construct Description / Denotes the root of the tree in an XPath expression. For example, /PO … predicate expressions. XPath supports a rich list of binary operators such as or, and, and not. For … number element under the PO root element. Functions XPath and XQuery support a set of built-in … namespace
Guideline: Use XMLOptimizationCheck to determine why a query is not rewritten → If a query has not been optimized, you can use system variable XMLOptimizationCheck to try to determine why. See Also: \"Diagnosing XQuery Optimization: XMLOptimizationCheck\" Footnote Legend Footnote 1: This example uses sample database schema OE and its table purchaseorder. The XML schema for this table is annotated with attribute SQLName to specify SQL object attribute names such as REQUESTOR —
Guideline: Look for underlying tables versus XML functions in execution plans → plan output that is generated when Oracle XML DB cannot perform XPath rewrite. The plan here is for … Generated When XPath Rewrite Does Not Occur Predicate Information (identified by operation id
Guideline: Name the default tables, so you recognize them in execution plans → When designing an XML schema, use annotation xdb:defaultTable to name the underlying tables that correspond to elements that you select in queries where performance is important. This lets you easily recognize them in an execution plan, indicating by their presence or absence whether the query has been rewritten.