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<html>
<head><title>
HDF5/H5A API Specification
</title>

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<!-- #BeginLibraryItem "/ed_libs/NavBar_RM.lbi" --><hr>
<center>
<table border=0 width=98%>
<tr><td valign=top align=left>
<a href="index.html">HDF5 documents and links</a>&nbsp;<br>
<a href="H5.intro.html">Introduction to HDF5</a>&nbsp;<br>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/doc/UG/index.html">HDF5 User Guide</a>&nbsp;<br>
<!--
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</td>
<td valign=top align=right>
And in this document, the 
<a href="RM_H5Front.html">HDF5 Reference Manual</a>&nbsp;&nbsp;
<br>
<a href="RM_H5.html">H5</a>&nbsp;&nbsp;
<a href="RM_H5A.html">H5A</a>&nbsp;&nbsp;
<a href="RM_H5D.html">H5D</a>&nbsp;&nbsp;
<a href="RM_H5E.html">H5E</a>&nbsp;&nbsp;
<a href="RM_H5F.html">H5F</a>&nbsp;&nbsp;
<a href="RM_H5G.html">H5G</a>&nbsp;&nbsp;
<a href="RM_H5I.html">H5I</a>&nbsp;&nbsp;
<a href="RM_H5P.html">H5P</a>&nbsp;&nbsp;
<br>
<a href="RM_H5R.html">H5R</a>&nbsp;&nbsp;
<a href="RM_H5S.html">H5S</a>&nbsp;&nbsp;
<a href="RM_H5T.html">H5T</a>&nbsp;&nbsp;
<a href="RM_H5Z.html">H5Z</a>&nbsp;&nbsp;
<a href="Tools.html">Tools</a>&nbsp;&nbsp;
<a href="PredefDTypes.html">Datatypes</a>&nbsp;&nbsp;
</td></tr>
</table>
</center>
<hr>
<!-- #EndLibraryItem --><center>
<h1>H5A: Attribute Interface</h1>
</center>

<h2>Attribute API Functions</h2>

These functions create and manipulate attributes 
and information about attributes.

<p>
<strong>The C Interfaces:</strong>

<table border=0>
<tr><td valign=top>
<ul>
    <li><a href="#Annot-Create">H5Acreate</a>
    <li><a href="#Annot-Write">H5Awrite</a>
    <li><a href="#Annot-Read">H5Aread</a>
    <li><a href="#Annot-Close">H5Aclose</a>
</ul>
</td><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign=top>
<ul>
    <li><a href="#Annot-GetName">H5Aget_name</a>
    <li><a href="#Annot-OpenName">H5Aopen_name</a>
    <li><a href="#Annot-OpenIdx">H5Aopen_idx</a>
    <li><a href="#Annot-GetSpace">H5Aget_space</a>
</ul>
</td><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign=top>
<ul>
    <li><a href="#Annot-GetType">H5Aget_type</a>
    <li><a href="#Annot-NumAttrs">H5Aget_num_attrs</a>
    <li><a href="#Annot-Iterate">H5Aiterate</a>
    <li><a href="#Annot-Delete">H5Adelete</a>
</ul>
</td></tr>
</table>
<br>

<i>Alphabetical Listing</i>

<table border="0">
  <tr>
    <td valign="top">
	<ul>
      <li><a href="#Annot-Close">H5Aclose</a>
      <li><a href="#Annot-Create">H5Acreate</a>
      <li><a href="#Annot-Delete">H5Adelete</a>
      <li><a href="#Annot-GetName">H5Aget_name</a>
	</ul>      
    </td>
    
    <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>
    
    <td valign="top">
	<ul>
      <li><a href="#Annot-NumAttrs">H5Aget_num_attrs</a>
      <li><a href="#Annot-GetSpace">H5Aget_space</a>
      <li><a href="#Annot-GetType">H5Aget_type</a>
      <li><a href="#Annot-Iterate">H5Aiterate</a>
    </ul>
	</td>
    
    <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>
    
    <td valign="top">
	<ul>
      <li><a href="#Annot-OpenIdx">H5Aopen_idx</a>
      <li><a href="#Annot-OpenName">H5Aopen_name</a>
      <li><a href="#Annot-Read">H5Aread</a>
      <li><a href="#Annot-Write">H5Awrite</a>
	</ul>
    </td>
  </tr>
</table>

<br>
<strong>The FORTRAN90 Interfaces:</strong>
<br>
In general, each FORTRAN90 subroutine performs exactly the same task 
as the corresponding C function.  
<br>

<table border=0>
<tr><td valign=top>
<ul>
    <li><a href="#Annot-Create">h5acreate_f</a>
    <li><a href="#Annot-Write">h5awrite_f</a>
    <li><a href="#Annot-Read">h5aread_f</a>
    <li><a href="#Annot-Close">h5aclose_f</a>
</ul>
</td><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign=top>
<ul>
    <li><a href="#Annot-GetName">h5aget_name_f</a>
    <li><a href="#Annot-OpenName">h5aopen_name_f</a>
    <li><a href="#Annot-OpenIdx">h5aopen_idx_f</a>
    <li><a href="#Annot-GetSpace">h5aget_space_f</a>
</ul>
</td><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign=top>
<ul>
    <li><a href="#Annot-GetType">h5aget_type_f</a>
    <li><a href="#Annot-NumAttrs">h5aget_num_attrs_f</a>
 <!--<li><a href="#Annot-Iterate">h5aiterate_f</a>-->
    <li><a href="#Annot-Delete">h5adelete_f</a>
</ul>
</td></tr>
</table>


<p>
The Attribute interface, H5A, is primarily designed to easily allow 
small datasets to be attached to primary datasets as metadata information. 
Additional goals for the H5A interface include keeping storage requirement 
for each attribute to a minimum and easily sharing attributes among 
datasets. 
<p>
Because attributes are intended to be small objects, large datasets 
intended as additional information for a primary dataset should be 
stored as supplemental datasets in a group with the primary dataset. 
Attributes can then be attached to the group containing everything 
to indicate a particular type of dataset with supplemental datasets 
is located in the group. How small is "small" is not defined by the 
library and is up to the user's interpretation. 
<p>
See <a href="Attributes.html"><cite>Attributes</cite></a> in the
<a href="H5.user.html"><cite>HDF5 User's Guide</cite></a> for further information.

<!-- NEW PAGE -->
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Aclose" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Annot-Close">H5Aclose</a>
<dt><strong>Signature:</strong>
    <dd><em>herr_t</em> <code>H5Aclose</code>(<em>hid_t</em> <code>attr_id</code>)
<dt><strong>Purpose:</strong>
    <dd>Closes the specified attribute.
<dt><strong>Description:</strong>
    <dd><code>H5Aclose</code> terminates access to the attribute 
        specified by <code>attr_id</code> by releasing the identifier.
        <p>
        Further use of a released attribute identifier is illegal; 
        a function using such an identifier will fail.
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>hid_t</em> <code>attr_id</code>
            <dd>IN: Attribute to release access to.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns a non-negative value if successful;
        otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5aclose_f
    <dd>
	<pre>
SUBROUTINE h5aclose_f(attr_id, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(OUT) :: attr_id  ! Attribute identifier 
  INTEGER, INTENT(OUT) :: hdferr          ! Error code:
                                          ! 0 on success and -1 on failure
END SUBROUTINE h5aclose_f	
	</pre>		
		
		<!--<dt><strong>Non-C API(s):</strong>
    	<dd>
        
        <img src="Graphics/Java.gif"> 
        <img src="Graphics/C++.gif">
        -->
</dl>

<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Acreate" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Annot-Create">H5Acreate</a>
<dt><strong>Signature:</strong>
    <dd><font size="-1"><em>hid_t</em> <code>H5Acreate</code>(<em>hid_t</em> <code>loc_id</code>,
        <em>const char *</em><code>name</code>,
        <em>hid_t</em> <code>type_id</code>,
        <em>hid_t</em> <code>space_id</code>,
        <em>hid_t</em> <code>create_plist</code></font>
    )
<dt><strong>Purpose:</strong>
    <dd>Creates a dataset as an attribute of another group, dataset, 
        or named datatype.
<dt><strong>Description:</strong>
    <dd><code>H5Acreate</code> creates an attribute named <code>name</code>
        and attached to the object specified with <code>loc_id</code>.  
        <code>loc_id</code> is a group, dataset, or named datatype identifier.
        <p>
        The attribute name specified in <code>name</code> must be unique. 
        Attempting to create an attribute with the same name as an already 
        existing attribute will fail, leaving the pre-existing attribute 
        in place.  To overwrite an existing attribute with a new attribute 
        of the same name, first call <code>H5Adelete</code> then recreate 
        the attribute with <code>H5Acreate</code>.
        <p>
        The datatype and dataspace identifiers of the attribute, 
        <code>type_id</code> and <code>space_id</code>, respectively, 
        are created with the H5T and H5S interfaces, respectively.  
        <p>
        Currently only simple dataspaces are allowed for attribute dataspaces.
        <p>
        The attribute creation property list, <code>create_plist</code>, 
        is currently unused;
        it may be used in the future for optional attribute properties.  
        At this time, <code>H5P_DEFAULT</code> is the only accepted value.
        </p>
        The attribute identifier returned from this function must be released 
        with <code>H5Aclose</code> or resource leaks will develop.  
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>hid_t</em> <code>loc_id</code></dt>
            <dd>IN: Object (dataset, group, or named datatype) to be attached to.</dd>
        <dt><em>const char *</em><code>name</code></dt>
            <dd>IN: Name of attribute to create.</dd>
        <dt><em>hid_t</em> <code>type_id</code></dt>
            <dd>IN: Identifier of datatype for attribute.</dd>
        <dt><em>hid_t</em> <code>space_id</code></dt>
            <dd>IN: Identifier of dataspace for attribute.</dd>
        <dt><em>hid_t</em> <code>create_plist</code></dt>
            <dd>IN: Identifier of creation property list. (Currently unused;
                    the only accepted value is <code>H5P_DEFAULT</code>.)</dd>
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns an attribute identifier if successful;
        otherwise returns a negative value.
			
		<!--<dt><strong>Non-C API(s):</strong>        
        <img src="Graphics/Java.gif"> 
        <img src="Graphics/C++.gif">
        -->
		
<dt><strong>Fortran90 Interface:</strong> h5acreate_f
    <dd>
	<pre>
SUBROUTINE h5acreate_f(obj_id, name, type_id, space_id, attr_id, &amp; 
                       hdferr, creation_prp) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: obj_id    ! Object identifier 
  CHARACTER(LEN=*), INTENT(IN) :: name    ! Attribute name
  INTEGER(HID_T), INTENT(IN) :: type_id   ! Attribute datatype identifier 
  INTEGER(HID_T), INTENT(IN) :: space_id  ! Attribute dataspace identifier
  INTEGER(HID_T), INTENT(OUT) :: attr_id  ! Attribute identifier 
  INTEGER, INTENT(OUT) :: hdferr          ! Error code:
                                          ! 0 on success and -1 on failure
  INTEGER(HID_T), OPTIONAL, INTENT(IN) :: creation_prp
                                          ! Attribute creation property 
                                          ! list identifier 
END SUBROUTINE h5acreate_f
	</pre>
</dl>

<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Adelete" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Annot-Delete">H5Adelete</a>
<dt><strong>Signature:</strong>
    <dd><em>herr_t</em> <code>H5Adelete</code>(<em>hid_t</em> <code>loc_id</code>,
        <em>const char *</em><code>name</code>
    )
<dt><strong>Purpose:</strong>
    <dd>Deletes an attribute from a location.
<dt><strong>Description:</strong>
    <dd><code>H5Adelete</code> removes the attribute specified by its  
        name, <code>name</code>, from a dataset, group, or named datatype. 
        This function should not be used when attribute identifiers are 
        open on <code>loc_id</code> as it may cause the internal indexes 
        of the attributes to change and future writes to the open 
        attributes to produce incorrect results. 
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>hid_t</em> <code>loc_id</code>
            <dd>IN: Identifier of the dataset, group, or named datatype 
                to have the attribute deleted from.
        <dt><em>const char *</em><code>name</code>
            <dd>IN: Name of the attribute to delete.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns a non-negative value if successful;
        otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5adelete_f
    <dd>
	<pre>
SUBROUTINE h5adelete_f(obj_id, name, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: obj_id    ! Object identifier 
  CHARACTER(LEN=*), INTENT(IN) :: name    ! Attribute name
  INTEGER, INTENT(OUT) :: hdferr          ! Error code:
                                          ! 0 on success and -1 on failure
END SUBROUTINE h5adelete_f
	</pre>		
		
		<!--<dt><strong>Non-C API(s):</strong>
    	<dd>
        
        <img src="Graphics/Java.gif"> 
        <img src="Graphics/C++.gif">
        -->
</dl>

<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Aget_name" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Annot-GetName">H5Aget_name</a>
<dt><strong>Signature:</strong>
    <dd><em>ssize_t</em> <code>H5Aget_name</code>(<em>hid_t</em> <code>attr_id</code>,
        <em>size_t</em> <code>buf_size</code>,
        <em>char *</em><code>buf</code>
    )
<dt><strong>Purpose:</strong>
    <dd>Gets an attribute name.
<dt><strong>Description:</strong>
    <dd><code>H5Aget_name</code> retrieves the name of an attribute 
        specified by the identifier, <code>attr_id</code>.
        Up to <code>buf_size</code> characters are stored in 
        <code>buf</code> followed by a <code>\0</code> string
        terminator.  If the name of the attribute is longer than 
        <code>(buf_size -1)</code>, the string terminator is stored in the
        last position of the buffer to properly terminate the string.
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>hid_t</em> <code>attr_id</code>
            <dd>IN: Identifier of the attribute.
        <dt><em>size_t</em> <code>buf_size</code>
            <dd>IN: The size of the buffer to store the name in.
        <dt><em>char *</em><code>buf</code>
            <dd>IN: Buffer to store name in.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns the length of the attribute's name, which may be
        longer than <code>buf_size</code>, if successful.
        Otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5aget_name_f
    <dd>
	<pre>
SUBROUTINE h5aget_name_f(attr_id, size, buf, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: attr_id  ! Attribute identifier 
  INTEGER, INTENT(IN) :: size            ! Buffer size 
  CHARACTER(LEN=*), INTENT(OUT) :: buf   ! Buffer to hold attribute name
  INTEGER, INTENT(OUT) :: hdferr         ! Error code: name length  
                                         ! on success and -1 on failure
END SUBROUTINE h5aget_name_f
	</pre>		
		
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Annot-NumAttrs">H5Aget_num_attrs</a>
<dt><strong>Signature:</strong>
    <dd><em>int</em> <code>H5Aget_num_attrs</code>(<em>hid_t</em> <code>loc_id</code>)
<dt><strong>Purpose:</strong>
    <dd>Determines the number of attributes attached to an object.
<dt><strong>Description:</strong>
    <dd><code>H5Aget_num_attrs</code> returns the number of attributes 
        attached to the object specified by its identifier, 
        <code>loc_id</code>.  
        The object can be a group, dataset, or named datatype.
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>hid_t</em> <code>loc_id</code>
            <dd>IN: Identifier of a group, dataset, or named datatype.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns the number of attributes if successful;
        otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5aget_num_attrs_f
    <dd>
	<pre>
SUBROUTINE h5aget_num_attrs_f(obj_id, attr_num, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: obj_id  ! Object identifier 
  INTEGER, INTENT(OUT) :: attr_num      ! Number of attributes of the object
  INTEGER, INTENT(OUT) :: hdferr        ! Error code:
                                        ! 0 on success and -1 on failure
END SUBROUTINE h5aget_num_attrs_f
	</pre>		
		
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Annot-GetSpace">H5Aget_space</a>
<dt><strong>Signature:</strong>
    <dd><em>hid_t</em> <code>H5Aget_space</code>(<em>hid_t</em> <code>attr_id</code>)
<dt><strong>Purpose:</strong>
    <dd>Gets a copy of the dataspace for an attribute.
<dt><strong>Description:</strong>
    <dd><code>H5Aget_space</code> retrieves a copy of the dataspace 
        for an attribute.  The dataspace identifier returned from 
        this function must be released with <code>H5Sclose</code>
        or resource leaks will develop.
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>hid_t</em> <code>attr_id</code>
            <dd>IN: Identifier of an attribute. 
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns attribute dataspace identifier if successful;
        otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5aget_space_f
    <dd>
	<pre>
SUBROUTINE h5aget_space_f(attr_id, space_id, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: attr_id   ! Attribute identifier 
  INTEGER(HID_T), INTENT(OUT) :: space_id ! Attribute dataspace identifier
  INTEGER, INTENT(OUT) :: hdferr          ! Error code:
                                          ! 0 on success and -1 on failure
END SUBROUTINE h5aget_space_f
	</pre>		
		
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Annot-GetType">H5Aget_type</a>
<dt><strong>Signature:</strong>
    <dd><em>hid_t</em> <code>H5Aget_type</code>(<em>hid_t</em> <code>attr_id</code>)
<dt><strong>Purpose:</strong>
    <dd>Gets an attribute datatype.
<dt><strong>Description:</strong>
    <dd><code>H5Aget_type</code> retrieves a copy of the datatype 
        for an attribute.  
        <p>
        The datatype is reopened if it is a named type before returning
        it to the application.  The datatypes returned by this function
        are always read-only.  If an error occurs when atomizing the 
        return datatype, then the datatype is closed.
        <p>
        The datatype identifier returned from this function must be 
        released with <code>H5Tclose</code> or resource leaks will develop.
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>hid_t</em> <code>attr_id</code>
            <dd>IN: Identifier of an attribute.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns a datatype identifier if successful;
        otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5aget_type_f
    <dd>
	<pre>
SUBROUTINE h5aget_type_f(attr_id, type_id, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: attr_id    ! Attribute identifier 
  INTEGER(HID_T), INTENT(OUT) :: type_id   ! Attribute datatype identifier
  INTEGER, INTENT(OUT) :: hdferr           ! Error code:
                                           ! 0 on success and -1 on failure
END SUBROUTINE h5aget_type_f
	</pre>		
		
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Annot-Iterate">H5Aiterate</a>
<dt><strong>Signature:</strong>
    <dd><em>herr_t</em> <code>H5Aiterate</code>(<em>hid_t</em> <code>loc_id</code>,
        <em>unsigned *</em> <code>idx</code>,
        <em>H5A_operator_t</em> <code>op</code>,
        <em>void *</em><code>op_data</code>
    )
<dt><strong>Purpose:</strong>
    <dd>Calls a user's function for each attribute on an object.
<dt><strong>Description:</strong>
    <dd><code>H5Aiterate</code> iterates over the attributes of
        the object specified by its identifier, <code>loc_id</code>.
        The object can be a group, dataset, or named datatype.
        For each attribute of the object, the <code>op_data</code>
        and some additional information specified below are passed 
        to the operator function <code>op</code>.
        The iteration begins with the attribute specified by its
        index, <code>idx</code>; the index for the next attribute 
        to be processed by the operator, <code>op</code>, is 
        returned in <code>idx</code>.
        If <code>idx</code> is the null pointer, then all attributes
        are processed.
        <p>
        The prototype for <code>H5A_operator_t</code> is: <br>
            <code>typedef herr_t (*H5A_operator_t)(hid_t <em>loc_id</em>,
                  const char *<em>attr_name</em>, 
                  void *<em>operator_data</em>);
            </code>
        <p>
        The operation receives the identifier for the group, dataset
        or named datatype being iterated over, <code>loc_id</code>, the
        name of the current attribute about the object, <code>attr_name</code>,
        and the pointer to the operator data passed in to <code>H5Aiterate</code>,
        <code>op_data</code>.  The return values from an operator are:
        <ul>
        <li>Zero causes the iterator to continue, returning zero when all 
            attributes have been processed.
        <li>Positive causes the iterator to immediately return that positive
            value, indicating short-circuit success.  The iterator can be
            restarted at the next attribute.
        <li>Negative causes the iterator to immediately return that value,
            indicating failure.  The iterator can be restarted at the next
            attribute.
        </ul>
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>hid_t</em> <code>loc_id</code>
            <dd>IN: Identifier of a group, dataset or named datatype.
        <dt><em>unsigned *</em> <code>idx</code>
            <dd>IN/OUT: Starting (IN) and ending (OUT) attribute index.
        <dt><em>H5A_operator_t</em> <code>op</code>
            <dd>IN: User's function to pass each attribute to
        <dt><em>void *</em><code>op_data</code>
            <dd>IN/OUT: User's data to pass through to iterator operator function
    </dl>
<dt><strong>Returns:</strong>
    <dd>If successful, returns the return value of the last operator 
        if it was non-zero, or zero if all attributes were processed.
        Otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
    <dd>None.
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	</pre>
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Annot-OpenIdx">H5Aopen_idx</a>
<dt><strong>Signature:</strong>
    <dd><em>hid_t</em> <code>H5Aopen_idx</code>(<em>hid_t</em> <code>loc_id</code>,
        <em>unsigned int</em> <code>idx</code>
    )
<dt><strong>Purpose:</strong>
    <dd>Opens the attribute specified by its index.
<dt><strong>Description:</strong>
    <dd><code>H5Aopen_idx</code> opens an attribute which is attached 
        to the object specified with <code>loc_id</code>. 
        The location object may be either a group, dataset, or 
        named datatype, all of which may have any sort of attribute.  
        The attribute specified by the index, <code>idx</code>, 
        indicates the attribute to access.  
        The value of <code>idx</code> is a 0-based, non-negative integer.
        The attribute identifier returned from this function must be 
        released with <code>H5Aclose</code> or resource leaks will develop. 
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>hid_t</em> <code>loc_id</code>
            <dd>IN: Identifier of the group, dataset, or named datatype 
                attribute to be attached to.
        <dt><em>unsigned int</em> <code>idx</code>
            <dd>IN: Index of the attribute to open.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns attribute identifier if successful;
        otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5aopen_idx_f
    <dd>
	<pre>
SUBROUTINE h5aopen_idx_f(obj_id, index, attr_id, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: obj_id      ! Object identifier 
  INTEGER, INTENT(IN) :: index              ! Attribute index 
  INTEGER(HID_T), INTENT(OUT) :: attr_id    ! Attribute identifier 
  INTEGER, INTENT(OUT) :: hdferr            ! Error code:
                                            ! 0 on success and -1 on failure
END SUBROUTINE h5aopen_idx_f
	</pre>		
		
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Annot-OpenName">H5Aopen_name</a>
<dt><strong>Signature:</strong>
    <dd><em>hid_t</em> <code>H5Aopen_name</code>(<em>hid_t</em> <code>loc_id</code>,
        <em>const char *</em><code>name</code>
    )
<dt><strong>Purpose:</strong>
    <dd> Opens an attribute specified by name.
<dt><strong>Description:</strong>
    <dd><code>H5Aopen_name</code> opens an attribute specified by 
         its name, <code>name</code>, which is attached to the 
         object specified with <code>loc_id</code>. 
         The location object may be either a group, dataset, or 
         named datatype, which may have any sort of attribute. 
         The attribute identifier returned from this function must 
         be released with <code>H5Aclose</code> or resource leaks 
         will develop. 
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>hid_t</em> <code>loc_id</code>
            <dd>IN: Identifier of a group, dataset, or named datatype 
                atttribute to be attached to.
        <dt><em>const char *</em><code>name</code>
            <dd>IN: Attribute name.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns attribute identifier if successful;
        otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5aopen_name_f
    <dd>
	<pre>
SUBROUTINE h5aopen_name_f(obj_id, name, attr_id, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: obj_id      ! Object identifier 
  CHARACTER(LEN=*), INTENT(IN) :: name      ! Attribute name
  INTEGER(HID_T), INTENT(OUT) :: attr_id    ! Attribute identifier 
  INTEGER, INTENT(OUT) :: hdferr            ! Error code:
                                            ! 0 on success and -1 on failure
END SUBROUTINE h5aopen_name_f
	</pre>		
		
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Annot-Read">H5Aread</a>
<dt><strong>Signature:</strong>
    <dd><em>herr_t</em> <code>H5Aread</code>(<em>hid_t</em> <code>attr_id</code>,
        <em>hid_t</em> <code>mem_type_id</code>,
        <em>void *</em><code>buf</code>
    )
<dt><strong>Purpose:</strong>
    <dd>Reads an attribute.
<dt><strong>Description:</strong>
    <dd><code>H5Aread</code> reads an attribute, specified with 
        <code>attr_id</code>.  The attribute's memory datatype 
        is specified with <code>mem_type_id</code>.  The entire 
        attribute is read into <code>buf</code> from the file. 
        <p>
        Datatype conversion takes place at the time of a read or write
        and is automatic.  See the
        <a href="Datatypes.html#Datatypes-DataConversion">Data Conversion</a> 
        section of <cite>The Data Type Interface (H5T)</cite> in the 
        <cite>HDF5 User's Guide</cite> for a discussion of 
        data conversion, including the range of conversions currently 
        supported by the HDF5 libraries.
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>hid_t</em> <code>attr_id</code>
            <dd>IN: Identifier of an attribute to read.
        <dt><em>hid_t</em> <code>mem_type_id</code>
            <dd>IN: Identifier of the attribute datatype (in memory).
        <dt><em>void *</em><code>buf</code>
            <dd>OUT: Buffer for data to be read.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns a non-negative value if successful;
        otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5aread_f
    <dd>
	<pre>
SUBROUTINE h5aread_f(attr_id, memtype_id,  buf, dims, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: attr_id    ! Attribute identifier 
  INTEGER(HID_T), INTENT(IN) :: memtype_id ! Attribute datatype 
                                           ! identifier  (in memory)
  TYPE, INTENT(INOUT)  :: buf              ! Data buffer; may be a scalar or 
                                           ! an array
  DIMENSION(*), INTEGER(HSIZE_T), INTENT(IN)  :: dims 
                                           ! Array to hold corresponding 
                                           ! dimension sizes of data buffer buf;
                                           ! dim(k) has value of the 
                                           ! k-th dimension of buffer buf;
                                           ! values are ignored if buf is a 
                                           ! scalar
  INTEGER, INTENT(OUT) :: hdferr           ! Error code:
                                           ! 0 on success and -1 on failure
END SUBROUTINE h5aread_f
	</pre>		
		
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<dl>
<dt><strong>Name:</strong> <a name="Annot-Write">H5Awrite</a>
<dt><strong>Signature:</strong>
    <dd><em>herr_t</em> <code>H5Awrite</code>(<em>hid_t</em> <code>attr_id</code>,
        <em>hid_t</em> <code>mem_type_id</code>,
        <em>const void *</em><code>buf</code>
    )
<dt><strong>Purpose:</strong>
    <dd>Writes data to an attribute.
<dt><strong>Description:</strong>
    <dd><code>H5Awrite</code> writes an attribute, specified with 
        <code>attr_id</code>.  The attribute's memory datatype 
        is specified with <code>mem_type_id</code>.  The entire 
        attribute is written from <code>buf</code> to the file. 
        <p>
        Datatype conversion takes place at the time of a read or write
        and is automatic.  See the
        <a href="Datatypes.html#Datatypes-DataConversion">Data Conversion</a> 
        section of <cite>The Data Type Interface (H5T)</cite> in the 
        <cite>HDF5 User's Guide</cite> for a discussion of 
        data conversion, including the range of conversions currently 
        supported by the HDF5 libraries.
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>hid_t</em> <code>attr_id</code>
            <dd>IN: Identifier of an attribute to write.
        <dt><em>hid_t</em> <code>mem_type_id</code>
            <dd>IN: Identifier of the attribute datatype (in memory).
        <dt><em>const void *</em><code>buf</code>
            <dd>IN: Data to be written.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns a non-negative value if successful;
        otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5awrite_f
    <dd>
	<pre>
SUBROUTINE h5awrite_f(attr_id, memtype_id,  buf, dims, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: attr_id    ! Attribute identifier 
  INTEGER(HID_T), INTENT(IN) :: memtype_id ! Attribute datatype 
                                           ! identifier  (in memory)
  TYPE, INTENT(IN) :: buf                  ! Data buffer; may be a scalar or 
                                           ! an array
  DIMENSION(*), INTEGER(HSIZE_T), INTENT(IN)  :: dims 
                                           ! Array to hold corresponding 
                                           ! dimension sizes of data buffer buf;
                                           ! dim(k) has value of the 
                                           ! k-th dimension of buffer buf; 
                                           ! values are ignored if buf is 
                                           ! a scalar
  INTEGER, INTENT(OUT) :: hdferr           ! Error code:
                                           ! 0 on success and -1 on failure
END SUBROUTINE h5awrite_f
	</pre>		
		
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