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46 // This file is not part of the Qt API. It exists purely as an
47 // implementation detail. This header file may change from version to
48 // version without notice, or even be removed.
52 #ifndef Patternist_DocumentFN_H
53 #define Patternist_DocumentFN_H
55 #include <private/qfunctioncall_p.h>
65 * @short Implements XSL-T's function <tt>fn:document()</tt>.
67 * @c fn:document() has no evaluation functions, because it rewrites
68 * itself to a set of expressions that is the implementation.
70 * The two-argument version:
72 * <tt>document($uris as item()*, $baseURINode as node()) as node()*</tt>
76 * <tt>for $uri in distinct-values($uris)
77 * return doc(resolve-uri($uri, base-uri($baseURINode)))</tt>
79 * and the single version argument:
81 * <tt>document($uris as item()*) as node()*</tt>
85 * <tt>for $uri in distinct-values($uris)
86 * return doc($uri)</tt>
88 * The distinct-values() call ensures the node deduplication and sorting,
89 * although it fails in the case that URIs resolve/directs in some way to
90 * the same document. Some of those cases can be solved by wrapping the
91 * whole expression with a node deduplication(conceptually the-for-loop/.).
92 * One advantage with distinct-values() over generating traditional node
93 * sorting/deduplication code is that the latter contains node sorting
94 * which is uecessary and can be hard to analyze away. distinct-values()
95 * doesn't have this problem due to its narrower task..
97 * This works without problems, assuming XTRE1160 is not raised and that
98 * the recover action instead is ignore. In the case XTRE1160 is raised,
99 * one must cater for this.
101 * In addition to this, both signatures has its first argument changed to
102 * type <tt>xs:string*</tt>, in order to generate atomization code.
104 * One notable thing is that the expression for $baseURINode, is moved
105 * inside a loop, and will be evaluated repeatedly, unless moved out as
106 * part of optimization.
108 * @ingroup Patternist_functions
109 * @author Frans Englich <frans.englich@nokia.com>
112 class DocumentFN : public FunctionCall
115 virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
116 const SequenceType::Ptr &reqType);