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diff --git a/libxsd-frontend/parser.hxx b/libxsd-frontend/parser.hxx
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+// file      : libxsd-frontend/parser.hxx
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+#ifndef LIBXSD_FRONTEND_PARSER_HXX
+#define LIBXSD_FRONTEND_PARSER_HXX
+
+#include <set>
+#include <memory> // std::unique_ptr
+
+#include <libxsd-frontend/types.hxx>
+#include <libxsd-frontend/semantic-graph/schema.hxx>
+
+namespace XSDFrontend
+{
+  struct InvalidSchema {};
+
+  class LocationTranslator
+  {
+  public:
+    virtual
+    ~LocationTranslator ();
+
+    virtual NarrowString
+    translate (NarrowString const& location) = 0;
+  };
+
+  // Set of disabled warning IDs. Special ID "all" disables all
+  // warnings.
+  //
+  typedef std::set<NarrowString> WarningSet;
+
+  class Parser
+  {
+  public:
+    ~Parser ();
+
+    Parser (bool proper_restriction,
+            bool multiple_imports,
+            bool full_schema_check);
+
+    Parser (bool proper_restriction,
+            bool multiple_imports,
+            bool full_schema_check,
+            LocationTranslator&,
+            const WarningSet& disabled);
+
+  private:
+    Parser (Parser const&);
+    Parser& operator= (Parser const&);
+
+  public:
+    // Parse a schema file. Throws InvalidSchema in case of a failure.
+    //
+    std::unique_ptr<SemanticGraph::Schema>
+    parse (SemanticGraph::Path const&);
+
+    // Parse a number of schema files all into one semantic graph.
+    // Each schema file is imported from an unnamed root translation
+    // unit. Throws InvalidSchema in case of a failure.
+    //
+    std::unique_ptr<SemanticGraph::Schema>
+    parse (SemanticGraph::Paths const&);
+
+    // Returns a schema graph that corresponds to the XML Schema
+    // namespace with built-in type definitions. The path is fake
+    // and is only used as a lable.
+    //
+    std::unique_ptr<SemanticGraph::Schema>
+    xml_schema (SemanticGraph::Path const&);
+
+  private:
+    class Impl;
+    std::unique_ptr<Impl> impl_;
+  };
+}
+
+#endif  // LIBXSD_FRONTEND_PARSER_HXX