Documentation step 4: Properly document tag functions.

diff --git a/xml-tree.hpp b/xml-tree.hpp
index aba3160..4ada586 100644 (file)
--- a/xml-tree.hpp
+++ b/xml-tree.hpp
@@ -162,8 +162,28 @@ public:
   uint32_t postorder(node_t) const;
 
   //Tag functions
+  /**
+   * [tag(n)] returns the tag of node [n] which must be a valid node identifier
+   * (in particular not NIL)
+   * Runs in O(1)
+   */
   inline tag_t tag(node_t) const;
+
+  /**
+   * [get_tag_name_by_ref(t)] returns the string representation of tag [t]
+   * For elements, the string representation is the tag name itself
+   * Returns <!INVALID!> if [t] is not a proper tag identifier.
+   * Runs in O(1)
+   */
   const char* get_tag_name_by_ref(tag_t) const;
+
+  /**
+   * [register_tag(s)] returns the tag identifier for the tag represented
+   * by the string [s]. If no such tag exists in the document, return a
+   * fresh tag identifier [i]. Subsequent calls with the same [s] will return
+   * the same identifier.
+   * Runs in O(1)
+   */
   tag_t register_tag(char *s);
 
   //Navigation functions