markup.sgml

<!-- ##### SECTION Title ##### -->
Simple XML Subset Parser

<!-- ##### SECTION Short_Description ##### -->
parses a subset of XML

<!-- ##### SECTION Long_Description ##### -->
<para>
The "GMarkup" parser is intended to parse a simple markup format
that's a subset of XML. This is a small, efficient, easy-to-use
parser. It should not be used if you expect to interoperate with other 
applications generating full-scale XML. However, it's very useful for
application data files, config files, etc. where you know your
application will be the only one writing the file. Full-scale XML
parsers should be able to parse the subset used by GMarkup, so you can
easily migrate to full-scale XML at a later time if the need arises.
</para>

<para>
GMarkup is not guaranteed to signal an error on all invalid XML; the
parser may accept documents that an XML parser would not. However, XML 
documents which are not well-formed<footnote id="wellformed">Being wellformed
is a weaker condition than being valid. See the 
<ulink url="http://www.w3.org/TR/REC-xml/">XML specification</ulink> for 
definitions of these terms.</footnote> are not considered valid GMarkup 
documents. 
</para>

<para>
Simplifications to XML include:
<itemizedlist>
<listitem>
<para>
Only UTF-8 encoding is allowed.
</para>
</listitem>
<listitem>
<para>
No user-defined entities.
</para>
</listitem>
<listitem>
<para>
Processing instructions, comments and the doctype declaration are "passed 
through" but are not interpreted in any way.
</para>
</listitem>
<listitem>
<para>
No DTD or validation.
</para>
</listitem>
</itemizedlist>
</para>

<para>
The markup format does support:
<itemizedlist>
<listitem>
<para>
Elements
</para>
</listitem>
<listitem>
<para>
Attributes
</para>
</listitem>
<listitem>
<para>
5 standard entities: <literal>&amp;amp; &amp;lt; &amp;gt; &amp;quot; &amp;apos;</literal>
</para>
</listitem>
<listitem>
<para>
Character references
</para>
</listitem>
<listitem>
<para>
Sections marked as CDATA
</para>
</listitem>
</itemizedlist>
</para>

<!-- ##### SECTION See_Also ##### -->
<para>

</para>

<!-- ##### SECTION Stability_Level ##### -->


<!-- ##### ENUM GMarkupError ##### -->
<para>
Error codes returned by markup parsing.
</para>

@G_MARKUP_ERROR_BAD_UTF8: text being parsed was not valid UTF-8
@G_MARKUP_ERROR_EMPTY: document contained nothing, or only whitespace
@G_MARKUP_ERROR_PARSE: document was ill-formed
@G_MARKUP_ERROR_UNKNOWN_ELEMENT: error should be set by #GMarkupParser functions; element wasn't known
@G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE: error should be set by #GMarkupParser functions; attribute wasn't known
@G_MARKUP_ERROR_INVALID_CONTENT: error should be set by #GMarkupParser functions; content was invalid
@G_MARKUP_ERROR_MISSING_ATTRIBUTE: error should be set by #GMarkupParser functions; a required attribute was missing

<!-- ##### MACRO G_MARKUP_ERROR ##### -->
<para>
Error domain for markup parsing. Errors in this domain will
be from the #GMarkupError enumeration. See #GError for information on 
error domains.
</para>



<!-- ##### ENUM GMarkupParseFlags ##### -->
<para>
Flags that affect the behaviour of the parser. 
</para>

@G_MARKUP_DO_NOT_USE_THIS_UNSUPPORTED_FLAG: flag you should not use.
@G_MARKUP_TREAT_CDATA_AS_TEXT: When this flag is set, CDATA marked
  sections are not passed literally to the @passthrough function of
  the parser. Instead, the content of the section (without the 
  <literal>&lt;![CDATA[</literal> and <literal>]]&gt;</literal>) is
  passed to the @text function. This flag was added in GLib 2.12.
@G_MARKUP_PREFIX_ERROR_POSITION: Normally errors caught by GMarkup
  itself have line/column information prefixed to them to let the
  caller know the location of the error.  When this flag is set the
  location information is also prefixed to errors generated by the
  #GMarkupParser implementation functions.

<!-- ##### STRUCT GMarkupParseContext ##### -->
<para>
A parse context is used to parse a stream of bytes that you expect to
contain marked-up text. See g_markup_parse_context_new(),
#GMarkupParser, and so on for more details.
</para>


<!-- ##### STRUCT GMarkupParser ##### -->
<para>
Any of the fields in #GMarkupParser can be %NULL, in which case they
will be ignored. Except for the @error function, any of these
callbacks can set an error; in particular the
%G_MARKUP_ERROR_UNKNOWN_ELEMENT, %G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE,
and %G_MARKUP_ERROR_INVALID_CONTENT errors are intended to be set 
from these callbacks. If you set an error from a callback,
g_markup_parse_context_parse() will report that error back to its caller.
</para>

@start_element: Callback to invoke when the opening tag of an element
    is seen.
@end_element: Callback to invoke when the closing tag of an element is seen.
    Note that this is also called for empty tags like 
    <literal>&lt;empty/&gt;</literal>.
@text: Callback to invoke when some text is seen (text is always
    inside an element). Note that the text of an element may be spread
    over multiple calls of this function. If the %G_MARKUP_TREAT_CDATA_AS_TEXT
    flag is set, this function is also called for the content of CDATA marked 
    sections.
@passthrough: Callback to invoke for comments, processing instructions 
    and doctype declarations; if you're re-writing the parsed document, 
    write the passthrough text back out in the same position. If the
    %G_MARKUP_TREAT_CDATA_AS_TEXT flag is not set, this function is also 
    called for CDATA marked sections.
@error: Callback to invoke when an error occurs.

<!-- ##### FUNCTION g_markup_escape_text ##### -->
<para>

</para>

@text: 
@length: 
@Returns: 


<!-- ##### FUNCTION g_markup_printf_escaped ##### -->
<para>

</para>

@format: 
@Varargs: 
@Returns: 


<!-- ##### FUNCTION g_markup_vprintf_escaped ##### -->
<para>

</para>

@format: 
@args: 
@Returns: 


<!-- ##### FUNCTION g_markup_parse_context_end_parse ##### -->
<para>

</para>

@context: 
@error: 
@Returns: 


<!-- ##### FUNCTION g_markup_parse_context_free ##### -->
<para>

</para>

@context: 


<!-- ##### FUNCTION g_markup_parse_context_get_position ##### -->
<para>

</para>

@context: 
@line_number: 
@char_number: 


<!-- ##### FUNCTION g_markup_parse_context_get_element ##### -->
<para>

</para>

@context: 
@Returns: 


<!-- ##### FUNCTION g_markup_parse_context_get_element_stack ##### -->
<para>

</para>

@context: 
@Returns: 


<!-- ##### FUNCTION g_markup_parse_context_new ##### -->
<para>

</para>

@parser: 
@flags: 
@user_data: 
@user_data_dnotify: 
@Returns: 


<!-- ##### FUNCTION g_markup_parse_context_parse ##### -->
<para>

</para>

@context: 
@text: 
@text_len: 
@error: 
@Returns: 


<!-- ##### FUNCTION g_markup_parse_context_push ##### -->
<para>

</para>

@context: 
@parser: 
@user_data: 


<!-- ##### FUNCTION g_markup_parse_context_pop ##### -->
<para>

</para>

@context: 
@Returns: 


<!-- ##### ENUM GMarkupCollectType ##### -->
<para>

</para>

@G_MARKUP_COLLECT_INVALID: 
@G_MARKUP_COLLECT_STRING: 
@G_MARKUP_COLLECT_STRDUP: 
@G_MARKUP_COLLECT_BOOLEAN: 
@G_MARKUP_COLLECT_TRISTATE: 
@G_MARKUP_COLLECT_OPTIONAL: 

<!-- ##### FUNCTION g_markup_collect_attributes ##### -->
<para>

</para>

@element_name: 
@attribute_names: 
@attribute_values: 
@error: 
@first_type: 
@first_attr: 
@Varargs: 
@Returns: