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<html>
<head><title>
HDF5/H5R Draft API Specification
</title></head>
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<h1>H5R: Reference Interface</h1>
</center>
<h2>Reference API Functions</h2>
The Reference interface allows the user to create references
to specific objects and data regions in an HDF5 file.
<p>
<table border=0>
<tr><td valign=top>
<ul>
<li><a href="#Reference-Create">H5Rcreate</a>
</ul>
</td><td> </td><td valign=top>
<ul>
<li><a href="#Reference-Dereference">H5Rdereference</a>
</ul>
</td><td> </td><td valign=top>
<ul>
<li><a href="#Reference-GetRegion">H5Rget_region</a> (NYI)
</ul>
</td></tr>
<tr><td colspan=5 align=right><font size=-1>
NYI = Not yet implemented.</font>
</td></tr>
</table>
<p>
<i>Note: The only type of reference implemented in this release
is an object reference pointing to a dataset.</i>
<p>
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Reference-Create">H5Rcreate</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Rcreate</code>(<em>href_t *</em><code>ref</code>,
<em>hid_t</em> <code>loc_id</code>,
<em>const char *</em><code>name</code>,
<em>H5R_type_t</em> <code>ref_type</code>,
<em>hid_t</em> <code>space_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Creates a reference.
<dt><strong>Description:</strong>
<dd><code>H5Rcreate</code> creates the reference, <code>ref</code>,
of the type specified in <code>ref_type</code>, pointing to
the object <code>name</code> located at <code>loc_id</code>.
<p>
The parameters <code>loc_id</code> and <code>name</code> are
used to locate the object.
<p>
The parameter <code>space_id</code> identifies the region
to be pointed to (for dataset region references).
<p>
<i>Note: Only object references of type <code>H5T_STD_REF_OBJ</code>
pointing to entire datasets are implemented at this time.</i>
<dt><strong>Parameters:</strong>
<dl>
<dt><em>href_t *</em><code>ref</code>
<dd>OUT: Reference created by the function call.
<dt><em>hid_t</em> <code>loc_id</code>
<dd>IN: Location identifier used to locate the object being
pointed to.
<dt><em>const char *</em><code>name</code>
<dd>IN: Name of object at location <code>loc_id</code>.
<dt><em>H5R_type_t</em> <code>ref_type</code>
<dd>IN: Type of reference.
<dt><em>hid_t</em> <code>space_id</code>
<dd>IN: Dataspace identifier with selection.
Used for dataset region references.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
</dl>
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Reference-Dereference">H5Rdereference</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t</em> <code>H5Rdereference</code>(<em>hid_t</em> <code>dataset</code>,
<em>H5R_type_t</em> <code>ref_type</code>,
<em>href_t *</em><code>ref</code>
)
<dt><strong>Purpose:</strong>
<dd>Opens the HDF5 object referenced.
<dt><strong>Description:</strong>
<dd>Given a reference to some object, <code>H5Rdereference</code>
opens that object and returns an identifier.
<p>
The parameter <code>ref_type</code> specifies the reference type
of <code>ref</code>. See
<a href="References.html#Reference-RefTypes">Reference Types</a> in
<a href="References.html"><i>References (H5R)</i></a>
for a list of valid reference types.
<dt><strong>Parameters:</strong>
<dl>
<dt><em>hid_t</em> <code>dataset</code>
<dd>IN: Dataset containing reference object.
<dt><em>H5R_type_t</em> <code>ref_type</code>
<dd>IN: The reference type of <code>ref</code>.
<dt><em>void *</em><code>ref</code>
<dd>IN: Reference to open.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns valid identifier if successful;
otherwise returns a negative value.
</dl>
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Reference-GetRegion">H5Rget_region</a>
<i>(Not yet implemented.)</i>
<dt><strong>Signature:</strong>
<dd><em>hid_t</em> <code>H5Rget_region</code>(<em>hid_t</em> <code>dataset</code>,
<em>H5R_type_t</em> <code>ref_type</code>,
<em>href_t *</em><code>ref</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves a dataspace with the specified region selected.
<dt><strong>Description:</strong>
<dd>Given a reference to an object <code>ref</code>,
<code>H5Rget_region</code> creates a copy of the dataspace
of the dataset pointed to and defines a selection in the copy
which is the region pointed to.
<p>
The parameter <code>ref_type</code> specifies the reference type
of <code>ref</code>. See
<a href="References.html#Reference-RefTypes">Reference Types</a> in
<a href="References.html"><i>References (H5R)</i></a>
for a list of valid reference types.
<dt><strong>Parameters:</strong>
<dl>
<dt><em>hid_t</em> <code>dataset</code>,
<dd>IN: Dataset containing reference object.
<dt><em>H5R_type_t</em> <code>ref_type</code>,
<dd>IN: The reference type of <code>ref</code>.
<dt><em>href_t *</em><code>ref</code>
<dd>IN: Reference to open.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns a valid identifier if successful;
otherwise returns a negative value.
</dl>
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Last modified: 27 October 1998
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