txt[
Perhaps the most common things to do in a macro definition is accessing parameters and attributes. When doing so, it is important to consider whether we want to retrieve the _raw value_ of and attribute or parameter or its _expanded value_. The difference between the two will become clearer in the following sections and also in the =>[#interpreting] section.
	]
	section[
		@title[Accessing Expanded Values]
		@id[expanded_values]
		txt[
Normally, you just want to get the value of an attribute or parameter and use it in the macro. This means, in other words, its _expanded_ value, i.e. the value resulting from the expansion of the macros (if any) within the attribute or parameter.
		]
		txt[
To access expanded values, use the following methods:
* @parameter@ (or @param@): Returns the expanded value of the parameter specified by number. Other parameters are not expanded.
* @value@: Returns the expanded value of the first parameter (i.e. like @parameter(0)@).
* @attribute@ (or @attr@): Returns the expanded value of the attribute specified by name. Other attributes are not expanded.
* @parameters@ (or @params@):  Returns an array of expanded parameters.
* @attributes@ (or @attrs@):  Returns a hash of expanded attributes.
 
		]
		
	]
	section[
		@title[Accessing Raw Values]
		p[While accessing expanded values is simple and immediate, in some cases it may not produce the desired results. Consider the following macro definition:]
		highlight[=ruby|
macro :nest_section do
  interpret %{section[
    @title[A]
    section[
      @title[B]
      #{value}
    ]
  ]}
end
		=]
		p[And suppose to use it as follows:]
		highlight[=ruby|
nest_section[
  section[
    @title[Inner Section]
    ...
  ]
]
		=]
		p[It produces the following HTML code:]
		highlight[=html|
<div class="section">
  <h2 id="h_2">A</h2>
  <div class="section">
    <h3 id="h_3">B</h3>
    <div class="section">
      <h2 id="h_1">Inner Section</h2>
...
    </div>
  </div>
</div>
		=]
		p[Everything is fine em[except] for the header level: the heading "Inner Section" is of level 2, but it should be level 4!]
		p[This happens because the inner section is evaluated em[before] the code[nest_section] macro: after all, we ask for it ourselves when we call the code[value] method inside the macro definition. When the value is expanded, there are no outer sections em[yet].]
		p[To avoid this unwanted behavior, we can use the code[raw_value] method instead, that returns the first parameter converted back to a Glyph code string.]
		tip[To be on the safe side, always use code[raw_*] methods when interpreting.]
		txt[
To access raw values, use the following methods:
* @raw_parameter@ (or @raw_param@): Returns the raw parameter value of the parameter specified by number.
* @raw_value@: Returns the first raw parameter value (i.e. like @raw_parameter(0)@).
* @raw_attribute@ (or @raw_attr@): Returns the attribute value of the attribute specified by name.
		]
	]