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diff --git a/src/transform.h b/src/transform.h
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+#ifndef _TRANSFORM_H
+#define _TRANSFORM_H
+
+#include "xpath.h"
+
+namespace ledger {
+
+class transform_t {
+ public:
+  virtual ~transform_t() {}
+  virtual void execute(xml::document_t * document) = 0;
+};
+
+class check_transform : public transform_t {
+  // --check checks the validity of the item list.
+ public:
+  virtual void execute(xml::document_t * document);
+};
+
+class accounts_transform : public transform_t {
+  // --accounts transforms the report tree into an account-wise view.
+ public:
+  virtual void execute(xml::document_t * document);
+};
+
+class compact_transform : public transform_t {
+  // --compact compacts an account tree to remove accounts with only
+  // one child account.
+ public:
+  virtual void execute(xml::document_t * document);
+};
+
+class clean_transform : public transform_t {
+  // --clean clears out entries and accounts that have no contents.
+ public:
+  virtual void execute(xml::document_t * document);
+};
+
+class entries_transform : public transform_t {
+  // --entries transforms the report tree into an entries-wise view.
+ public:
+  virtual void execute(xml::document_t * document);
+};
+
+class optimize_transform : public transform_t {
+  // --optimize optimizes entries for display by the print command.
+  // What this means is that if an entry has two transactions of the
+  // commodity (one the negative of the other), the amount of the
+  // second transaction will be nulled out.
+ public:
+  virtual void execute(xml::document_t * document);
+};
+
+class split_transform : public transform_t {
+  // --split breaks entry with two or more transactions into what
+  // seems like two entries each with one transaction -- even though
+  // it is the same entry being reported in both cases.  This is
+  // useful before sorting, for exampel, in order to sort by
+  // transaction instead of by entry.
+ public:
+  virtual void execute(xml::document_t * document);
+};
+
+class merge_transform : public transform_t {
+  // --merge is the opposite of --split: any adjacent transactions
+  // which share the same entry will be merged into a group of
+  // transactions under one reported entry.
+ public:
+  virtual void execute(xml::document_t * document);
+};
+
+class combine_transform : public transform_t {
+  // --combine EXPR combines all transactions matching EXPR so that
+  // they appear within the same virtual entry (whose date will span
+  // the earliest to the latest of those entries, and whose payee name
+  // will show the terminating date or a label that is characteristic
+  // of the set).
+ public:
+  virtual void execute(xml::document_t * document);
+};
+
+class group_transform : public transform_t {
+  // --group groups all transactions that affect the same account
+  // within an entry, so that they appear as a single transaction.
+ public:
+  virtual void execute(xml::document_t * document);
+};
+
+class collapse_transform : public transform_t {
+  // --collapse makes all transactions within an entry appear as a
+  // single transaction, even if they affect different accounts.  The
+  // fictitous account "<total>" is used to represent the final sum,
+  // if multiple accounts are involved.
+ public:
+  virtual void execute(xml::document_t * document);
+};
+
+class subtotal_transform : public transform_t {
+  // --subtotal will combine the transactions from all entries into
+  // one giant entry.  When used in conjunction with --group, the
+  // affect is very similar to a regular balance report.
+ public:
+  virtual void execute(xml::document_t * document);
+};
+
+#if 0
+class select_transform : public transform_t
+{
+ protected:
+  xml::xpath_t xpath;
+
+ public:
+  select_transform(const string& selection_path) {
+    xpath.parse(selection_path);
+  }
+  virtual ~select_transform() {
+    if (path)
+      delete path;
+  }
+
+  virtual void execute(xml::document_t * document);
+};
+
+class remove_transform : public select_transform
+{
+ public:
+  remove_transform(const string& selection_path)
+    : select_transform(selection_path) {}
+
+  virtual void execute(xml::document_t * document);
+};
+#endif
+
+} // namespace ledger
+
+#endif // _TRANSFORM_H