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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>4.SRU</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="YAZ User's Guide and Reference"><link rel="up" href="soap.html" title="Chapter6.SOAP and SRU"><link rel="prev" href="soap.xml.html" title="3.SOAP Packages"><link rel="next" href="tools.html" title="Chapter7.Supporting Tools"></head><body><link rel="stylesheet" type="text/css" href="common/style1.css"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">4.SRU</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="soap.xml.html">Prev</a></td><th width="60%" align="center">Chapter6.SOAP and SRU</th><td width="20%" align="right"><a accesskey="n" href="tools.html">Next</a></td></tr></table><hr></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="soap.srw"></a>4.SRU</h2></div></div></div><p>
SRU SOAP is just one implementation of a SOAP handler as described
in the previous section.
The encoder/decoder handler for SRU is defined as
follows:
</p><pre class="synopsis">
#include <yaz/srw.h>
int yaz_srw_codec(ODR o, void * pptr,
Z_SRW_GDU **handler_data,
void *client_data, const char *ns);
</pre><p>
Here, <code class="literal">Z_SRW_GDU</code> is either
searchRetrieveRequest or a searchRetrieveResponse.
</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>
The xQuery and xSortKeys are not handled yet by
the SRW implementation of YAZ. Explain is also missing.
Future versions of YAZ will include these features.
</p></div><p>
The definition of searchRetrieveRequest is:
</p><pre class="synopsis">
typedef struct {
#define Z_SRW_query_type_cql 1
#define Z_SRW_query_type_xcql 2
#define Z_SRW_query_type_pqf 3
int query_type;
union {
char *cql;
char *xcql;
char *pqf;
} query;
#define Z_SRW_sort_type_none 1
#define Z_SRW_sort_type_sort 2
#define Z_SRW_sort_type_xSort 3
int sort_type;
union {
char *none;
char *sortKeys;
char *xSortKeys;
} sort;
int *startRecord;
int *maximumRecords;
char *recordSchema;
char *recordPacking;
char *database;
} Z_SRW_searchRetrieveRequest;
</pre><p>
Please observe that data of type xsd:string is represented
as a char pointer (<code class="literal">char *</code>). A null pointer
means that the element is absent.
Data of type xsd:integer is representd as a pointer to
an int (<code class="literal">int *</code>). Again, a null pointer
us used for absent elements.
</p><p>
The SearchRetrieveResponse has the following definition.
</p><pre class="synopsis">
typedef struct {
int * numberOfRecords;
char * resultSetId;
int * resultSetIdleTime;
Z_SRW_record *records;
int num_records;
Z_SRW_diagnostic *diagnostics;
int num_diagnostics;
int *nextRecordPosition;
} Z_SRW_searchRetrieveResponse;
</pre><p>
The <code class="literal">num_records</code> and <code class="literal">num_diagnostics</code>
is number of returned records and diagnostics respectively and also
correspond to the "size of" arrays <code class="literal">records</code>
and <code class="literal">diagnostics</code>.
</p><p>
A retrieval record is defined as follows:
</p><pre class="synopsis">
typedef struct {
char *recordSchema;
char *recordData_buf;
int recordData_len;
int *recordPosition;
} Z_SRW_record;
</pre><p>
The record data is defined as a buffer of some length so that
data can be of any type. SRW 1.0 currenly doesn't allow for this
(only XML), but future versions might do.
</p><p>
And, a diagnostic as:
</p><pre class="synopsis">
typedef struct {
int *code;
char *details;
} Z_SRW_diagnostic;
</pre><p>
</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="soap.xml.html">Prev</a></td><td width="20%" align="center"><a accesskey="u" href="soap.html">Up</a></td><td width="40%" align="right"><a accesskey="n" href="tools.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">3.SOAP Packages</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">Chapter7.Supporting Tools</td></tr></table></div></body></html>
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