update the manual

docs/src/index.md

@@ -37,14 +37,14 @@ for genus in eachelement(primates)
     println("- ", genus_name)
     for species in eachelement(genus)
         # Get the content within an element.
-        species_name = content(species)
+        species_name = nodecontent(species)
         println("  └ ", species["name"], " (", species_name, ")")
     end
 end
 println()
 
 # Find texts using XPath query.
-for species_name in content.(find(primates, "//species/text()"))
+for species_name in nodecontent.(find(primates, "//species/text()"))
     println("- ", species_name)
 end
 ```

docs/src/manual.md

@@ -7,6 +7,12 @@ first. Once you have read it, [the references page](references.md) would be a
 better place to find necessary functions. [The developer notes
 page](devnotes.md) is for developers and most users do not need to read it.
 
+In this manual, we use `using EzXML` for the sake of brevity.  However, it is
+recommended to use `import EzXML` for long scripts or packages because EzXML.jl
+exports a number of names to your environment. These are useful in interactive
+sessions but easily conflict with other names. If you want to see the list of
+exported names, please go to the top of src/EzXML.jl.
+
 Data types
 ----------