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Diff for /doc/homework/xml.html between versions 1.2 and 1.6

version 1.2, 2001/05/21 15:24:47 version 1.6, 2002/10/21 17:10:35
Line 23 Line 23
  <i>$Apache::lonxml::debug</i> - debugging control   <i>$Apache::lonxml::debug</i> - debugging control
       </li>        </li>
       <li>        <li>
  <i>@Apache::lonxml::pwd</i> - path to the directory containing the file currently being processed    <i>@Apache::lonxml::pwd</i> - path to the directory containing
    the file currently being processed
       </li>        </li>
       <li>        <li>
  <i>@Apache::lonxml::outputstack</i> <br />   <i>@Apache::lonxml::outputstack</i> <br />
Line 36 Line 37
  &lt;import&gt; tag actually does anything   &lt;import&gt; tag actually does anything
       </li>        </li>
       <li>        <li>
  <i>@Apache::lonxml::extlinks</i> -   <i>@Apache::lonxml::extlinks</i> - a list of URLs that the
    user is allowed to look at because of the current resource
    (images, and links)
       </li>        </li>
       <li>        <li>
  <i>#Apache::lonxml::metamode</i> - some output is turned off,   <i>$Apache::lonxml::metamode</i> - some output is turned off,
  the meta target wants a specific subset, use &lt;output&gt; to   the meta target wants a specific subset, use &lt;output&gt; to
  guarentee that the catianed data will be in the parsing output   guarentee that the catianed data will be in the parsing output
       </li>        </li>
       <li>        <li>
  <i>#Apache::lonxml::evaluate</i> - controls whether   <i>$Apache::lonxml::evaluate</i> - controls whether
  run::evaluate actually derefences variable references   run::evaluate actually derefences variable references
       </li>        </li>
       <li>        <li>
Line 56 Line 59
  namespaces used in the insertlist.tab file that are currently   namespaces used in the insertlist.tab file that are currently
  active, used only in edit mode.   active, used only in edit mode.
       </li>        </li>
         <li>
    <i>$Apache::lonxml::registered</i> - set to 1 once the remote
    has been updated to know what resource we are looking at.
         </li>
         <li>
    <i>$Apache::lonxml::request</i> - current Apache request
    object, or undef
         </li>
         <li>
    <i>$Apache::lonxml::curdepth</i> - current depth of the
    overall parse depth. Will be a string like: 2_3_1 (first tag
    in the third second level tag in the second toplevel tag). It
    gets set by callsub, and can be used in Perl tag
    implementations. It relies upon the internal globals:
    <i>@Apache::lonxml::depthcounter</i>,
    <i>$Apache::lonxml::depth</i>,
    <i>$Apache::lonxml::olddepth</i>
         </li>
         <li>
    <i>$Apache::lonxml::prevent_entity_encode</i> - By default the
    xmlparser will try to rencode any 8-bit characters into HTML
    Entity Codes, If this is set to a true value it will be
    prevented.
         </li>
         <li>
    <i>$Apache::lonxml::errorcount</i> - keeps count of the number
    of errors generated in a parse
         </li>
         <li>
    <i>$Apache::lonxml::warningcount</i> - keeps count of the
    number of errors generated in a parse
         </li>
         <li>
    <i>$Apache::lonxml::counter</i> <br />
    <i>$Apache::lonxml::counter_changed</i> - a counter used to
    keep track of the number of questions asked, used currently to
    track bubble numbers, Initialized off of $ENV{'form.counter'},
    and writes this value to the environment if counter_changed is
    true, should use the &increment_counter() function to
    increment this value.
         </li>
     </ul>      </ul>
   
       <p>
         In common usage, <i>$Apache::lonxml::prevent_entity_encode</i>,
         <i>$Apache::lonxml::evaluate</i>,
         <i>$Apache::lonxml::metamode</i>,
         <i>$Apache::lonxml::import</i>, should never be set to a value
         directly, but rather incremented when you want the effect on,
         and decremented when you want the effect off.
       </p>
       
     <h3>Notable Perl subroutines</h3>      <h3>Notable Perl subroutines</h3>
     <p>      <p>
       If not specified these functions are in Apache::lonxml        If not specified these functions are in Apache::lonxml
     </p>      </p>
     <ul>      <ul>
       <li>        <li>
  <i>xmlparse</i> - see the XMLPARSE figure   <i>xmlparse</i> - see the XMLPARSE figure - also not callable
    from inside a tag, if one needs to restart parsing, either
    create add a new LCParser to the parser stack parser using the
    newparser function, or call inner_xmlparser, see the xmlparse
    function in scripttag.pm
       </li>        </li>
       <li>        <li>
  <i>recurse</i> - acts just like <i>xmlparse</i>, except it   <i>recurse</i> - acts just like <i>xmlparse</i>, except it
Line 89 Line 146
  %Apache::lonxml::insertlist structure of what tags can have   %Apache::lonxml::insertlist structure of what tags can have
  what other tags inside.   what other tags inside.
       </li>        </li>
         <li>
    <i>whichuser</i> - returns a list of $symb, $courseid,
    $domain, $name that is correct for calls to lonnet functions
    for this setup. Uses form.grade_ parameters, if the user is
    allowed to mgr in the course
         </li>
         <li>
    <i>setup_globals</i> - initializes all lonxml globals when
    xmlparse is called. If you intend to create a new target you
    will likely need to tweak how the globals are setup upon start
    up.
         </li>
         <li>
    <i>init_safespace</i> - creates Holes to external functions,
    creates some global variables, and set the permitted operators
    of the global Safespace intepreter.
         </li>
     </ul>      </ul>
     <h3>Functions Tag Handlers can use</h3>      <h3>Functions Tag Handlers can use</h3>
     <p>      <p>
Line 121 Line 195
  Apache::scripttag::start_script for an example of usage.)   Apache::scripttag::start_script for an example of usage.)
       </li>        </li>
       <li>        <li>
  <i>get_param</i> - 4 arguments, firsth is a scaler sting of   <i>get_param</i> - 4 arguments, first is a scaler sting of
  the argument needed, second is a reference to the parser   the argument needed, second is a reference to the parser
  arguments stack, third is a reference to the Safe space, and   arguments stack, third is a reference to the Safe space, and
  fourth is an optional "context" value. This subroutine allows   fourth is an optional "context" value. This subroutine allows
  a tag to get a tag argument, after being interpolated inside   a tag to get a tag argument, after being interpolated inside
  the Safe space. This should be used if the tag might use a   the Safe space. This should be used if the tag might use a
  safe space variable reference for the tag argument. (See   safe space variable reference for the tag argument. (See
  Apaceh::scripttag::start_script for an example.)   Apache::scripttag::start_script for an example.)
   
    This version only handles scalar variables.
         </li>
         <li>
    <i>get_param_var</i> - 4 arguments, first is a scaler sting of
    the argument needed, second is a reference to the parser
    arguments stack, third is a reference to the Safe space, and
    fourth is an optional "context" value. This subroutine allows
    a tag to get a tag argument, after being interpolated inside
    the Safe space. This should be used if the tag might use a
    safe space variable reference for the tag argument. (See
    Apache::scripttag::start_script for an example.)
   
    This version can handle list or hash variables properly.
         </li>
         <li>
    <i>description</i> - 1 argument, the token object. This will
    return the textual decription of the current tag from the
    insertlist.tab file.
         </li>
         <li>
    <i>whichuser</i> - 0 arguments. This will take a look at the
    current environment setting and return the current $symb,
    $courseid, $udom, $uname. You should always use this function
    if you want to determine who the current user is. (Since a
    instructor might be trying to view a students version of a
    resource.)
         </li>
         <li>
    <i>inner_xmlparse</i> - 6 arguments, the target, an array
    pointer to the current stack of tags, and array pointer to the
    current stack of tag arguments, an array pointer to the
    current stack of LCParser's, a pointer to the current Safe
    space, a pointer to the hash of current style definitions
       </li>        </li>
       <li>        <li>
  <i>newparser</i> - 3 args, first is a reference to the parser   <i>newparser</i> - 3 args, first is a reference to the parser
Line 149  sub BEGIN { Line 257  sub BEGIN {
 }  }
 </pre>  </pre>
  Would tell xmlparse that in Apache::scripttag it can find   Would tell xmlparse that in Apache::scripttag it can find
  handlers for &lt;script&gt; and &lt;display&gt;   handlers for &lt;script&gt; and &lt;display&gt;, if one
    regsiters a tag that was already registered the previous one
    is remembered and will be restored on a deregister.
         </li>
         <li>
    <i>deregister</i> - used to remove a previously registered tag
    implementation. It will restore the previous registration if
    there was one.
       </li>        </li>
       <li>        <li>
  <i>startredirection</i> - used when a tag wants to save a   <i>startredirection</i> - used when a tag wants to save a
Line 168  sub BEGIN { Line 283  sub BEGIN {
  a reference to the Safe space, 3 a string to be evaluated   a reference to the Safe space, 3 a string to be evaluated
  before the first arg. This subroutine will do variable   before the first arg. This subroutine will do variable
  interpolation and simple function interpolations on the first   interpolation and simple function interpolations on the first
  argument. (See Apache::lonxml::xmlparse for an example.)   argument. (See Apache::lonxml::inner_xmlparse for an example.)
       </li>        </li>
       <li>        <li>
  <i>Apache::run::run</i> - 2 args, first a string, second a   <i>Apache::run::run</i> - 2 args, first a string, second a
Line 204  sub BEGIN { Line 319  sub BEGIN {
     <address><a href="mailto:albertel@marvin.lite.msu.edu">Guy Albertelli</a></address>      <address><a href="mailto:albertel@marvin.lite.msu.edu">Guy Albertelli</a></address>
 <!-- Created: Sun May 20 15:47:08 EDT 2001 -->  <!-- Created: Sun May 20 15:47:08 EDT 2001 -->
 <!-- hhmts start -->  <!-- hhmts start -->
 Last modified: Mon May 21 11:21:05 EDT 2001  Last modified: Mon Oct 21 13:23:28 EDT 2002
 <!-- hhmts end -->  <!-- hhmts end -->
   </body>    </body>
 </html>  </html>
Removed from v.1.2  
changed lines
  Added in v.1.6

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