<!-- $Id: asn.xml,v 1.11 2001/10/25 11:55:56 adam Exp $ -->
 <chapter id="asn"><title>The Z39.50 ASN.1 Module</title>
  <sect1 id="asn.introduction"><title>Introduction</title>
   <para>
    The &asn; module provides you with a set of C struct definitions for the
    various PDUs of the Z39.50 protocol, as well as for the complex types
    appearing within the PDUs. For the primitive data types, the C
    representation often takes the form of an ordinary C language type,
    such as <literal>int</literal>. For ASN.1 constructs that have no direct
    representation in C, such as general octet strings and bit strings,
    the &odr; module (see section <link linkend="odr">The ODR Module</link>)
    provides auxiliary definitions.
   </para>
   <para>
    The &asn; module is located in sub directory <filename>z39.50</filename>.
    There you'll find C files that implements encoders and decoders for the
    Z39.50 types. You'll also find the protocol definitions:
    <filename>z3950v3.asn</filename>, <filename>esupdate.asn</filename>, 
    and others.
   </para>
  </sect1>
  <sect1 id="asn.preparing"><title>Preparing PDUs</title>
   
   <para>
    A structure representing a complex ASN.1 type doesn't in itself contain the
    members of that type. Instead, the structure contains
    <emphasis>pointers</emphasis> to the members of the type.
    This is necessary, in part, to allow a mechanism for specifying which
    of the optional structure (SEQUENCE) members are present, and which
    are not. It follows that you will need to somehow provide space for
    the individual members of the structure, and set the pointers to
    refer to the members.
   </para>
   <para>
    The conversion routines don't care how you allocate and maintain your
    C structures - they just follow the pointers that you provide.
    Depending on the complexity of your application, and your personal
    taste, there are at least three different approaches that you may take
    when you allocate the structures.
   </para>
   
   <para>
    You can use static or automatic local variables in the function that
    prepares the PDU. This is a simple approach, and it provides the most
    efficient form of memory management. While it works well for flat
    PDUs like the InitReqest, it will generally not be sufficient for say,
    the generation of an arbitrarily complex RPN query structure.
   </para>
   <para>
    You can individually create the structure and its members using the
    <function>malloc(2)</function> function. If you want to ensure that
    the data is freed when it is no longer needed, you will have to
    define a function that individually releases each member of a
    structure before freeing the structure itself.
   </para>
   <para>
    You can use the <function>odr_malloc()</function> function (see section 
    <link linkend="odr-use">Using ODR</link> for details). When you use
    <function>odr_malloc()</function>, you can release all of the
    allocated data in a single operation, independent of any pointers and
    relations between the data. <function>odr_malloc()</function> is based on a
    &quot;nibble-memory&quot;
    scheme, in which large portions of memory are allocated, and then
    gradually handed out with each call to <function>odr_malloc()</function>.
    The next time you call <function>odr_reset()</function>, all of the
    memory allocated since the last call is recycled for future use (actually,
    it is placed on a free-list).
   </para>
   <para>
    You can combine all of the methods described here. This will often be
    the most practical approach. For instance, you might use
    <function>odr_malloc()</function> to allocate an entire structure and
    some of its elements, while you leave other elements pointing to global
    or per-session default variables.
   </para>
   
   <para>
    The &asn; module provides an important aid in creating new PDUs. For
    each of the PDU types (say, <function>Z_InitRequest</function>), a
    function is provided that allocates and initializes an instance of
    that PDU type for you. In the case of the InitRequest, the function is
    simply named <function>zget_InitRequest()</function>, and it sets up
    reasonable default value for all of the mandatory members. The optional
    members are generally initialized to null pointers. This last aspect
    is very important: it ensures that if the PDU definitions are
    extended after you finish your implementation (to accommodate
    new versions of the protocol, say), you won't get into trouble with
    uninitialized pointers in your structures. The functions use
    <function>odr_malloc()</function> to
    allocate the PDUs and its members, so you can free everything again with a
    single call to <function>odr_reset()</function>. We strongly recommend
    that you use the <literal>zget_*</literal>
    functions whenever you are preparing a PDU (in a C++ API, the
    <literal>zget_</literal>
    functions would probably be promoted to constructors for the
    individual types).
   </para>
   <para>
   The prototype for the individual PDU types generally look like this:
   </para>
   <synopsis>
    Z_&lt;type> *zget_&lt;type>(ODR o);
   </synopsis>
   
   <para>
    eg.:
   </para>
   
   <synopsis>
    Z_InitRequest *zget_InitRequest(ODR o);
   </synopsis>

   <para>
   The &odr; handle should generally be your encoding stream, but it
    needn't be.
   </para>
   <para>
   As well as the individual PDU functions, a function
    <function>zget_APDU()</function> is provided, which allocates
    a top-level Z-APDU of the type requested:
   </para>
   
   <synopsis>
    Z_APDU *zget_APDU(ODR o, int which);
   </synopsis>
   
   <para>
    The <varname>which</varname> parameter is (of course) the discriminator
    belonging to the <varname>Z_APDU</varname> <literal>CHOICE</literal> type.
    All of the interface described here is provided by the &asn; module, and
    you access it through the <filename>proto.h</filename> header file.
    
   </para>
  </sect1>
  <sect1 id="asn.oid"><title id="oid">Object Identifiers</title>
  <para>
    When you refer to object identifiers in your application, you need to
    be aware that SR and Z39.50 use two different set of OIDs to refer to
    the same objects. To handle this easily, &yaz; provides a utility module
    to &asn; which provides an internal representation of the OIDs used in
    both protocols. Each oid is described by a structure:
   </para>
   
   <screen>
typedef struct oident
{
    enum oid_proto proto;
    enum oid_class class;
    enum oid_value value;
    int oidsuffix[OID_SIZE];
    char *desc;
} oident;
   </screen>
   
   <para>
    The <literal>proto</literal> field can be set to either
    <literal>PROTO_SR</literal> or <literal>PROTO_Z3950</literal>.
    The <literal>class</literal> might be, say,
    <literal>CLASS_RECSYN</literal>, and the <literal>value</literal> might be
    <literal>VAL_USMARC</literal> for the USMARC record format. Functions
   </para>
   
   <screen>
int *oid_ent_to_oid(struct oident *ent, int *dst);
struct oident *oid_getentbyoid(int *o);
   </screen>
   
   <para>
    are provided to map between object identifiers and database entries.
    If you store a member of the <literal>oid_proto</literal> type in
    your association state information, it's a simple matter, at runtime,
    to generate the correct OID when you need it. For decoding, you can
    simply ignore the proto field, or if you're strict, you can verify
    that your peer is using the OID family from the correct protocol.
    The <literal>desc</literal> field is a short, human-readable name
    for the PDU, useful mainly for diagnostic output.
   </para>
   
   <note>
    <para>
     The old function <function>oid_getoidbyent</function> still exists but
     is not thread safe. Use <function>oid_ent_to_oid</function> instead
     and pass an array of size <literal>OID_SIZE</literal>.
    </para>
   </note>
   
   <note>
    <para>
     Plans are underway to merge the two protocols into a single
     definition, with one set of object identifiers. When this happens, the
     oid module will no longer be required to support protocol
     independence, but it should still be useful as a simple OID database.
    </para>
   </note>
  
  </sect1>
  <sect1 id="asn.external"><title>EXTERNAL Data</title>
   
   <para>
    In order to achieve extensibility and adaptability to different
    application domains, the new version of the protocol defines many
    structures outside of the main ASN.1 specification, referencing them
    through ASN.1 EXTERNAL constructs. To simplify the construction and
    access to the externally referenced data, the &asn; module defines a
    specialized version of the EXTERNAL construct, called
    <literal>Z_External</literal>.It is defined thus:
   </para>
   
   <screen>
typedef struct Z_External
{
    Odr_oid *direct_reference;
    int *indirect_reference;
    char *descriptor;
    enum
    {
        /* Generic types */
        Z_External_single = 0,
        Z_External_octet,
        Z_External_arbitrary,

        /* Specific types */
        Z_External_SUTRS,
        Z_External_explainRecord,
        Z_External_resourceReport1,
        Z_External_resourceReport2

    ...

    } which;
    union
    {
        /* Generic types */
        Odr_any *single_ASN1_type;
        Odr_oct *octet_aligned;
        Odr_bitmask *arbitrary;

        /* Specific types */
        Z_SUTRS *sutrs;
        Z_ExplainRecord *explainRecord;
        Z_ResourceReport1 *resourceReport1;
        Z_ResourceReport2 *resourceReport2;

        ...

    } u;
} Z_External;
   </screen>
   
   <para>
    When decoding, the &asn; module will attempt to determine which
    syntax describes the data by looking at the reference fields
    (currently only the direct-reference). For ASN.1 structured data, you
    need only consult the <literal>which</literal> field to determine the
    type of data. You can the access  the data directly through the union.
    When constructing data for encoding, you set the union pointer to point
    to the data, and set the <literal>which</literal> field accordingly.
    Remember also to set the direct (or indirect) reference to the correct
    OID for the data type.
    For non-ASN.1 data such as MARC records, use the
    <literal>octet_aligned</literal> arm of the union.
   </para>
   
   <para>
    Some servers return ASN.1 structured data values (eg. database
    records) as BER-encoded records placed in the
    <literal>octet-aligned</literal> branch of the EXTERNAL CHOICE.
    The ASN-module will <emphasis>not</emphasis> automatically decode
    these records. To help you decode the records in the application, the
    function
   </para>
   
   <screen>
   Z_ext_typeent *z_ext_gettypebyref(oid_value ref);
   </screen>

   <para>
    Can be used to retrieve information about the known, external data
    types. The function return a pointer to a static area, or NULL, if no
    match for the given direct reference is found. The
    <literal>Z_ext_typeent</literal>
    is defined as:
   </para>
  
   <screen>
typedef struct Z_ext_typeent
{
    oid_value dref;    /* the direct-reference OID value. */
    int what;          /* discriminator value for the external CHOICE */
    Odr_fun fun;       /* decoder function */
} Z_ext_typeent;
   </screen>
   
   <para>
    The <literal>what</literal> member contains the
    <literal>Z_External</literal> union discriminator value for the
    given type: For the SUTRS record syntax, the value would be
    <literal>Z_External_sutrs</literal>.
    The <literal>fun</literal> member contains a pointer to the
    function which encodes/decodes the given type. Again, for the SUTRS
    record syntax, the value of <literal>fun</literal> would be
    <literal>z_SUTRS</literal> (a function pointer).
   </para>
   
   <para>
    If you receive an EXTERNAL which contains an octet-string value that
    you suspect of being an ASN.1-structured data value, you can use
    <literal>z_ext_gettypebyref</literal> to look for the provided
    direct-reference.
    If the return value is different from NULL, you can use the provided
    function to decode the BER string (see section <link linkend="odr-use">
     Using ODR</link>).
   </para>
   
   <para>
    If you want to <emphasis>send</emphasis> EXTERNALs containing
    ASN.1-structured values in the occtet-aligned branch of the CHOICE, this
    is possible too. However, on the encoding phase, it requires a somewhat
    involved juggling around of the various buffers involved.
   </para>
   <para>
    If you need to add new, externally defined data types, you must update
    the struct above, in the source file <filename>prt-ext.h</filename>, as
    well as the encoder/decoder in the file <filename>prt-ext.c</filename>.
    When changing the latter, remember to update both the
    <literal>arm</literal> arrary and the list
    <literal>type_table</literal>, which drives the CHOICE biasing that
    is necessary to tell the different, structured types apart
    on decoding.
   </para>
   
   <note>
    <para>
     Eventually, the EXTERNAL processing will most likely
     automatically insert the correct OIDs or indirect-refs. First,
     however, we need to determine how application-context management
     (specifically the presentation-context-list) should fit into the
     various modules.
    </para>
   </note>
  
  </sect1>
  <sect1 id="asn.pdu"><title>PDU Contents Table</title>
   
  <para>
    We include, for reference, a listing of the fields of each top-level
    PDU, as well as their default settings.
   </para>
   
   <table frame="top"><title>Default settings for PDU Initialize Request</title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
    <thead>
     <row>
      <entry>Field</entry>
      <entry>Type</entry>
      <entry>Default Value</entry>
     </row>
    </thead>
    <tbody>
     <row><entry>
       referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
      </entry></row>
     <row><entry>
       protocolVersion</entry><entry>Odr_bitmask</entry><entry>Empty bitmask
      </entry></row>
     <row><entry>
       options</entry><entry>Odr_bitmask</entry><entry>Empty bitmask
      </entry></row>
     <row><entry>
       preferredMessageSize</entry><entry>int</entry><entry>30*1024
      </entry></row>
     <row><entry>
       maximumRecordSize</entry><entry>int</entry><entry>30*1024
      </entry></row>
     <row><entry>
       idAuthentication</entry><entry>Z_IdAuthentication</entry><entry>NULL
      </entry></row>
     <row><entry>
       implementationId</entry><entry>char*</entry><entry>"81"
      </entry></row>
     <row><entry>
       implementationName</entry><entry>char*</entry><entry>"YAZ"
      </entry></row>
     <row><entry>
       implementationVersion</entry><entry>char*</entry><entry>YAZ_VERSION
      </entry></row>
     <row><entry>
       userInformationField</entry><entry>Z_UserInformation</entry><entry>NULL
      </entry></row>
     <row><entry>
       otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
      </entry></row>
    </tbody>
   </tgroup>
  </table>

  <table frame="top"><title>Default settings for PDU Initialize
    Response</title>
   <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
    <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	protocolVersion</entry><entry>Odr_bitmask</entry><entry>Empty bitmask
       </entry></row>
      <row><entry>
	options</entry><entry>Odr_bitmask</entry><entry>Empty bitmask
       </entry></row>
      <row><entry>
	preferredMessageSize</entry><entry>int</entry><entry>30*1024
       </entry></row>
      <row><entry>
	maximumRecordSize</entry><entry>int</entry><entry>30*1024
       </entry></row>
      <row><entry>
	result</entry><entry>bool_t</entry><entry>TRUE
       </entry></row>
      <row><entry>
	implementationId</entry><entry>char*</entry><entry>"id)"
       </entry></row>
      <row><entry>
	implementationName</entry><entry>char*</entry><entry>"YAZ"
       </entry></row>
      <row><entry>
	implementationVersion</entry><entry>char*</entry><entry>YAZ_VERSION
       </entry></row>
      <row><entry>
	userInformationField</entry><entry>Z_UserInformation</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>

   <table frame="top"><title>Default settings for PDU Search Request</title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	smallSetUpperBound</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	largeSetLowerBound</entry><entry>int</entry><entry>1
       </entry></row>
      <row><entry>
	mediumSetPresentNumber</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	replaceIndicator</entry><entry>bool_t</entry><entry>TRUE
       </entry></row>
      <row><entry>
	resultSetName</entry><entry>char *</entry><entry>"default"
       </entry></row>
      <row><entry>
	num_databaseNames</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	databaseNames</entry><entry>char **</entry><entry>NULL
       </entry></row>
      <row><entry>
	smallSetElementSetNames</entry><entry>Z_ElementSetNames
       </entry><entry>NULL
       </entry></row>
      <row><entry>
	mediumSetElementSetNames</entry><entry>Z_ElementSetNames
       </entry><entry>NULL
       </entry></row>
      <row><entry>
	preferredRecordSyntax</entry><entry>Odr_oid</entry><entry>NULL
       </entry></row>
      <row><entry>
	query</entry><entry>Z_Query</entry><entry>NULL
       </entry></row>
      <row><entry>
	additionalSearchInfo</entry><entry>Z_OtherInformation
       </entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>

   <table frame="top"><title>Default settings for PDU Search Response</title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	resultCount</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	numberOfRecordsReturned</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	nextResultSetPosition</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	searchStatus</entry><entry>bool_t</entry><entry>TRUE
       </entry></row>
      <row><entry>
	resultSetStatus</entry><entry>int</entry><entry>NULL
       </entry></row>
      <row><entry>
	presentStatus</entry><entry>int</entry><entry>NULL
       </entry></row>
      <row><entry>
	records</entry><entry>Z_Records</entry><entry>NULL
       </entry></row>
      <row><entry>
	additionalSearchInfo</entry>
       <entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>

   <table frame="top"><title>Default settings for PDU Present Request</title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	resultSetId</entry><entry>char*</entry><entry>"default"
       </entry></row>
      <row><entry>
	resultSetStartPoint</entry><entry>int</entry><entry>1
       </entry></row>
      <row><entry>
	numberOfRecordsRequested</entry><entry>int</entry><entry>10
       </entry></row>
      <row><entry>
	num_ranges</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	additionalRanges</entry><entry>Z_Range</entry><entry>NULL
       </entry></row>
      <row><entry>
	recordComposition</entry><entry>Z_RecordComposition</entry><entry>NULL
       </entry></row>
      <row><entry>
	preferredRecordSyntax</entry><entry>Odr_oid</entry><entry>NULL
       </entry></row>
      <row><entry>
	maxSegmentCount</entry><entry>int</entry><entry>NULL
       </entry></row>
      <row><entry>
	maxRecordSize</entry><entry>int</entry><entry>NULL
       </entry></row>
      <row><entry>
	maxSegmentSize</entry><entry>int</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>
   
   <table frame="top"><title>Default settings for PDU Present Response</title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	numberOfRecordsReturned</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	nextResultSetPosition</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	presentStatus</entry><entry>int</entry><entry>Z_PRES_SUCCESS
       </entry></row>
      <row><entry>
	records</entry><entry>Z_Records</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>
   
   <table frame="top"><title>Default settings for Delete Result Set Request
    </title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      <row><entry>referenceId
       </entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	deleteFunction</entry><entry>int</entry><entry>Z_DeleteRequest_list
       </entry></row>
      <row><entry>
	num_ids</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	resultSetList</entry><entry>char**</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>

   <table frame="top"><title>Default settings for Delete Result Set Response
    </title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	deleteOperationStatus</entry><entry>int</entry>
       <entry>Z_DeleteStatus_success</entry></row>
      <row><entry>
	num_statuses</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	deleteListStatuses</entry><entry>Z_ListStatus**</entry><entry>NULL
       </entry></row>
      <row><entry>
	numberNotDeleted</entry><entry>int</entry><entry>NULL
       </entry></row>
      <row><entry>
	num_bulkStatuses</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	bulkStatuses</entry><entry>Z_ListStatus</entry><entry>NUL
	L</entry></row>
      <row><entry>
	deleteMessage</entry><entry>char*</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>

   <table frame="top"><title>Default settings for Scan Request
    </title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	num_databaseNames</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	databaseNames</entry><entry>char**</entry><entry>NULL
       </entry></row>
      <row><entry>
	attributeSet</entry><entry>Odr_oid</entry><entry>NULL
       </entry></row>
      <row><entry>
	termListAndStartPoint</entry><entry>Z_AttributesPlus...
       </entry><entry>NULL</entry></row>
      <row><entry>
	stepSize</entry><entry>int</entry><entry>NULL
       </entry></row>
      <row><entry>
	numberOfTermsRequested</entry><entry>int</entry><entry>20
       </entry></row>
      <row><entry>
	preferredPositionInResponse</entry><entry>int</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>

   <table frame="top"><title>Default settings for Scan Response
    </title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	stepSize</entry><entry>int</entry><entry>NULL
       </entry></row>
      <row><entry>
	scanStatus</entry><entry>int</entry><entry>Z_Scan_success
       </entry></row>
      <row><entry>
	numberOfEntriesReturned</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	positionOfTerm</entry><entry>int</entry><entry>NULL
       </entry></row>
      <row><entry>
	entries</entry><entry>Z_ListEntris</entry><entry>NULL
       </entry></row>
      <row><entry>
	attributeSet</entry><entry>Odr_oid</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>

   <table frame="top"><title>Default settings for Trigger Resource
     Control Request </title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	requestedAction</entry><entry>int</entry><entry>
	Z_TriggerResourceCtrl_resou..
       </entry></row>
      <row><entry>
	prefResourceReportFormat</entry><entry>Odr_oid</entry><entry>NULL
       </entry></row>
      <row><entry>
	resultSetWanted</entry><entry>bool_t</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
      
     </tbody>
    </tgroup>
   </table>

   <table frame="top"><title>Default settings for Resource
     Control Request</title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	suspendedFlag</entry><entry>bool_t</entry><entry>NULL
       </entry></row>
      <row><entry>
	resourceReport</entry><entry>Z_External</entry><entry>NULL
       </entry></row>
      <row><entry>
	partialResultsAvailable</entry><entry>int</entry><entry>NULL
       </entry></row>
      <row><entry>
	responseRequired</entry><entry>bool_t</entry><entry>FALSE
       </entry></row>
      <row><entry>
	triggeredRequestFlag</entry><entry>bool_t</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>

   <table frame="top"><title>Default settings for Resource
     Control Response</title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	continueFlag</entry><entry>bool_t</entry><entry>TRUE
       </entry></row>
      <row><entry>
	resultSetWanted</entry><entry>bool_t</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>
   
   <table frame="top"><title>Default settings for Access
     Control Request</title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	which</entry><entry>enum</entry><entry>Z_AccessRequest_simpleForm;
       </entry></row>
      <row><entry>
	u</entry><entry>union</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>

   <table frame="top"><title>Default settings for Access
     Control Response</title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	which</entry><entry>enum</entry><entry>Z_AccessResponse_simpleForm
       </entry></row>
      <row><entry>
	u</entry><entry>union</entry><entry>NULL
       </entry></row>
      <row><entry>
	diagnostic</entry><entry>Z_DiagRec</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>

   <table frame="top"><title>Default settings for Segment</title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>
      
      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	numberOfRecordsReturned</entry><entry>int</entry><entry>value=0
       </entry></row>
      <row><entry>
	num_segmentRecords</entry><entry>int</entry><entry>0
       </entry></row>
      <row><entry>
	segmentRecords</entry><entry>Z_NamePlusRecord</entry><entry>NULL
       </entry></row>
      <row><entry>otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
     </tbody>
    </tgroup>
   </table>

   <table frame="top"><title>Default settings for Close</title>
    <tgroup cols="3">
     <colspec colwidth="7*" colname="field"></colspec>
     <colspec colwidth="5*" colname="type"></colspec>
     <colspec colwidth="7*" colname="value"></colspec>
     <thead>
      <row>
       <entry>Field</entry>
       <entry>Type</entry>
       <entry>Default Value</entry>
      </row>
     </thead>
     <tbody>

      <row><entry>
	referenceId</entry><entry>Z_ReferenceId</entry><entry>NULL
       </entry></row>
      <row><entry>
	closeReason</entry><entry>int</entry><entry>Z_Close_finished
       </entry></row>
      <row><entry>
	diagnosticInformation</entry><entry>char*</entry><entry>NULL
       </entry></row>
      <row><entry>
	resourceReportFormat</entry><entry>Odr_oid</entry><entry>NULL
       </entry></row>
      <row><entry>
	resourceFormat</entry><entry>Z_External</entry><entry>NULL
       </entry></row>
      <row><entry>
	otherInfo</entry><entry>Z_OtherInformation</entry><entry>NULL
       </entry></row>
      
     </tbody>
    </tgroup>
   </table>

  </sect1>
 </chapter>

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