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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>QOF: Entities</title>
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<h1>Entities<br>
<small>
[<a class="el" href="group__Entity.html">Entity: Types, Identity and Instance Framework</a>]</small>
</h1><hr><a name="_details"></a><h2>Detailed Description</h2>
This file defines an API that adds types to the GUID's. GUID's with types can be used to identify and reference typed entities.<p>
The idea here is that a GUID can be used to uniquely identify some thing. By adding a type, one can then talk about the type of thing identified. By adding a collection, one can then work with a handle to a collection of things of a given type, each uniquely identified by a given ID. QOF Entities can be used independently of any other part of the system. In particular, Entities can be useful even if one is not using the Query ond Object parts of the QOF system.<p>
Identifiers are globally-unique and permanent, i.e., once an entity has been assigned an identifier, it retains that same identifier for its lifetime. Identifiers can be encoded as hex strings.<p>
GUID Identifiers are 'typed' with strings. The native ids used by QOF are defined below. An id with type QOF_ID_NONE does not refer to any entity, although that may change (???). An id with type QOF_ID_NULL does not refer to any entity, and will never refer to any entity. An identifier with any other type may refer to an actual entity, but that is not guaranteed (??? Huh?). If an id does refer to an entity, the type of the entity will match the type of the identifier.<p>
If you have a type name, and you want to have a way of finding a collection that is associated with that type, then you must use Books.
<p>
<table border=0 cellpadding=0 cellspacing=0>
<tr><td></td></tr>
<tr><td colspan=2><br><h2>Files</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>file </td><td class="memItemRight" valign=bottom><a class="el" href="qofid_8h.html">qofid.h</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">QOF entity type identification system. <br><br></td></tr>
<p>
<tr><td colspan=2><br><h2>Data Structures</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>struct </td><td class="memItemRight" valign=bottom><b>QofEntity_s</b></td></tr>
<tr><td colspan=2><br><h2>Collections of Entities</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>typedef void(* </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga4">QofEntityForeachCB</a> )(QofEntity *, gpointer user_data)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="ga8" doxytag="Entities::qof_collection_new" ></a>
QofCollection * </td><td class="memItemRight" valign=bottom><b>qof_collection_new</b> (QofIdType type)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga9">qof_collection_destroy</a> (QofCollection *col)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>QofIdType </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga10">qof_collection_get_type</a> (QofCollection *)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>QofEntity * </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga11">qof_collection_lookup_entity</a> (QofCollection *, const <a class="el" href="union__GUID.html">GUID</a> *)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga12">qof_collection_foreach</a> (QofCollection *, <a class="el" href="group__Entities.html#ga4">QofEntityForeachCB</a>, gpointer user_data)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>gpointer </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga13">qof_collection_get_data</a> (QofCollection *col)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="ga14" doxytag="Entities::qof_collection_set_data" ></a>
void </td><td class="memItemRight" valign=bottom><b>qof_collection_set_data</b> (QofCollection *col, gpointer user_data)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>gboolean </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga15">qof_collection_is_dirty</a> (QofCollection *col)</td></tr>
<tr><td colspan=2><br><h2>QOF Entity Initialization & Shutdown</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga5">qof_entity_init</a> (QofEntity *, QofIdType, QofCollection *)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga6">qof_entity_release</a> (QofEntity *)</td></tr>
<tr><td colspan=2><br><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="ga16" doxytag="Entities::QOF_ID_NONE" ></a>
#define </td><td class="memItemRight" valign=bottom><b>QOF_ID_NONE</b> NULL</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="ga17" doxytag="Entities::QOF_ID_NULL" ></a>
#define </td><td class="memItemRight" valign=bottom><b>QOF_ID_NULL</b> "null"</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="ga18" doxytag="Entities::QOF_ID_BOOK" ></a>
#define </td><td class="memItemRight" valign=bottom><b>QOF_ID_BOOK</b> "Book"</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="ga19" doxytag="Entities::QOF_ID_FREQSPEC" ></a>
#define </td><td class="memItemRight" valign=bottom><b>QOF_ID_FREQSPEC</b> "FreqSpec"</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="ga20" doxytag="Entities::QOF_ID_SESSION" ></a>
#define </td><td class="memItemRight" valign=bottom><b>QOF_ID_SESSION</b> "Session"</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>#define </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga21">QOF_ENTITY</a>(object) ((QofEntity *)(object))</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>#define </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga22">QSTRCMP</a>(da, db)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>#define </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga23">QOF_CHECK_TYPE</a>(obj, type) (0 == QSTRCMP((type),(((QofEntity *)(obj))->e_type)))</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>#define </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga24">QOF_CHECK_CAST</a>(obj, e_type, c_type)</td></tr>
<tr><td colspan=2><br><h2>Typedefs</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="ga0" doxytag="Entities::QofIdType" ></a>
typedef const char * </td><td class="memItemRight" valign=bottom><b>QofIdType</b></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="ga1" doxytag="Entities::QofIdTypeConst" ></a>
typedef const char * </td><td class="memItemRight" valign=bottom><b>QofIdTypeConst</b></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="ga2" doxytag="Entities::QofEntity" ></a>
typedef QofEntity_s </td><td class="memItemRight" valign=bottom><b>QofEntity</b></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="ga3" doxytag="Entities::QofCollection" ></a>
typedef QofCollection_s </td><td class="memItemRight" valign=bottom><b>QofCollection</b></td></tr>
<tr><td colspan=2><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>const <a class="el" href="union__GUID.html">GUID</a> * </td><td class="memItemRight" valign=bottom><a class="el" href="group__Entities.html#ga7">qof_entity_get_guid</a> (QofEntity *)</td></tr>
</table>
<hr><h2>Define Documentation</h2>
<a class="anchor" name="ga24" doxytag="qofid.h::QOF_CHECK_CAST" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top"> #define QOF_CHECK_CAST</td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">obj, <tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>e_type, <tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>c_type </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap>
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</td>
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<td>
</td>
<td>
<p>
<b>Value:</b><div class="fragment"><pre>( \
<a class="code" href="group__Entities.html#ga23">QOF_CHECK_TYPE</a>((obj),(e_type)) ? \
(c_type *) (obj) : \
(c_type *) ({ \
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL, \
<span class="stringliteral">"Error: Bad QofEntity at %s:%d"</span>, __FILE__, __LINE__); \
(obj); \
}))
</pre></div>cast object to the indicated type, print error message if its bad </td>
</tr>
</table>
<a class="anchor" name="ga23" doxytag="qofid.h::QOF_CHECK_TYPE" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top"> #define QOF_CHECK_TYPE</td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">obj, <tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>type </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> (0 == QSTRCMP((type),(((QofEntity *)(obj))->e_type)))
</table>
</td>
</tr>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
return TRUE if object is of the given type </td>
</tr>
</table>
<a class="anchor" name="ga21" doxytag="qofid.h::QOF_ENTITY" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top"> #define QOF_ENTITY</td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">object </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> ((QofEntity *)(object))
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</td>
</tr>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
simple,cheesy cast but holds water for now </td>
</tr>
</table>
<a class="anchor" name="ga22" doxytag="qofid.h::QSTRCMP" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top"> #define QSTRCMP</td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">da, <tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>db </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
<b>Value:</b><div class="fragment"><pre>({ \
<span class="keywordtype">int</span> val = 0; \
<span class="keywordflow">if</span> ((da) && (db)) { \
<span class="keywordflow">if</span> ((da) != (db)) { \
val = strcmp ((da), (db)); \
} \
} <span class="keywordflow">else</span> \
<span class="keywordflow">if</span> ((!(da)) && (db)) { \
val = -1; \
} <span class="keywordflow">else</span> \
<span class="keywordflow">if</span> ((da) && (!(db))) { \
val = 1; \
} \
val; <span class="comment">/* block assumes value of last statment */</span> \
})
</pre></div>Inline string comparision; compiler will optimize away most of this </td>
</tr>
</table>
<hr><h2>Typedef Documentation</h2>
<a class="anchor" name="ga4" doxytag="qofid.h::QofEntityForeachCB" ></a><p>
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<td class="md" nowrap valign="top"> typedef void(* <a class="el" href="group__Entities.html#ga4">QofEntityForeachCB</a>)(QofEntity *, gpointer user_data)
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Callback type for qof_entity_foreach </td>
</tr>
</table>
<hr><h2>Function Documentation</h2>
<a class="anchor" name="ga9" doxytag="qofid.h::qof_collection_destroy" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="md" nowrap valign="top"> void qof_collection_destroy </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">QofCollection * </td>
<td class="mdname1" valign="top" nowrap> <em>col</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
</td>
</tr>
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<a class="anchor" name="ga12" doxytag="qofid.h::qof_collection_foreach" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top"> void qof_collection_foreach </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">QofCollection * </td>
<td class="mdname" nowrap>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="group__Entities.html#ga4">QofEntityForeachCB</a> </td>
<td class="mdname" nowrap>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>gpointer </td>
<td class="mdname" nowrap> <em>user_data</em></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
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</td>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Call the callback for each entity in the collection. </td>
</tr>
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<a class="anchor" name="ga13" doxytag="qofid.h::qof_collection_get_data" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="md" nowrap valign="top"> gpointer qof_collection_get_data </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">QofCollection * </td>
<td class="mdname1" valign="top" nowrap> <em>col</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Store and retreive arbitrary object-defined data<p>
XXX We need to add a callback for when the collection is being destroyed, so that the user has a chance to clean up anything that was put in the 'data' member here. </td>
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<a class="anchor" name="ga10" doxytag="qofid.h::qof_collection_get_type" ></a><p>
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<td class="md" nowrap valign="top"> QofIdType qof_collection_get_type </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">QofCollection * </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
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</td>
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<td>
</td>
<td>
<p>
return the type that the collection stores </td>
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<a class="anchor" name="ga15" doxytag="qofid.h::qof_collection_is_dirty" ></a><p>
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<td class="md" nowrap valign="top"> gboolean qof_collection_is_dirty </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">QofCollection * </td>
<td class="mdname1" valign="top" nowrap> <em>col</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
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</td>
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<td>
</td>
<td>
<p>
Return value of 'dirty' flag on collection </td>
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<a class="anchor" name="ga11" doxytag="qofid.h::qof_collection_lookup_entity" ></a><p>
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<td class="md" nowrap valign="top"> QofEntity* qof_collection_lookup_entity </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">QofCollection * </td>
<td class="mdname" nowrap>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>const <a class="el" href="union__GUID.html">GUID</a> * </td>
<td class="mdname" nowrap></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
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</td>
</tr>
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<td>
</td>
<td>
<p>
Find the entity going only from its guid </td>
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<a class="anchor" name="ga7" doxytag="qofid.h::qof_entity_get_guid" ></a><p>
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<td class="md" nowrap valign="top"> const <a class="el" href="union__GUID.html">GUID</a>* qof_entity_get_guid </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">QofEntity * </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
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</td>
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</td>
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<p>
Return the GUID of this entity </td>
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<a class="anchor" name="ga5" doxytag="qofid.h::qof_entity_init" ></a><p>
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<td class="md" nowrap valign="top"> void qof_entity_init </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">QofEntity * </td>
<td class="mdname" nowrap>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>QofIdType </td>
<td class="mdname" nowrap>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>QofCollection * </td>
<td class="mdname" nowrap></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
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</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Initialise the memory associated with an entity </td>
</tr>
</table>
<a class="anchor" name="ga6" doxytag="qofid.h::qof_entity_release" ></a><p>
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<td class="md" nowrap valign="top"> void qof_entity_release </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">QofEntity * </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Release the data associated with this entity. Dont actually free the memory associated with the instance. </td>
</tr>
</table>
<hr size="1"><address style="align: right;"><small>Generated on Sun May 23 15:41:48 2004 for QOF by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border=0 > </a>1.3.6-20040222 </small></address>
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