Can i query from a results which got from another query?

if i query a container and i get a results,then if i want to query in the results,can i?and how to do it?
thanks a lot!

Hi Turingcat,
In the dbxml shell you can use contextQuery. Here is an example on a test container holding the following documents:
dbxml> getDocuments
4 documents found
dbxml> print
<doc><node><aa>1</aa><bb>2</bb></node><node><aa>3</aa><bb>4</bb></node><node><aa>5</aa><bb>6</bb></node></doc>
<doc><node><aa>1</aa><bb>2</bb></node><node><aa>3</aa><bb>4</bb></node></doc>
<doc><node><aa>1</aa><bb>2</bb></node><node><aa>3</aa><bb>4</bb></node><node><aa>5</aa><bb>6</bb></node><node><aa>7</aa>
<bb>8</bb></node></doc>
<doc><node><aa>1</aa><bb>2</bb></node></doc>, that first retrieve all the documents that have a <bb>6</bb> node:
dbxml> query "for $i in collection('mnodes.dbxml')/doc where $i/node/bb=6 return $i"
2 objects returned for eager expression 'for $i in collection('mnodes.dbxml')/doc where $i/node/bb=6 return $i'
dbxml> print
<doc><node><aa>1</aa><bb>2</bb></node><node><aa>3</aa><bb>4</bb></node><node><aa>5</aa><bb>6</bb></node></doc>
<doc><node><aa>1</aa><bb>2</bb></node><node><aa>3</aa><bb>4</bb></node><node><aa>5</aa><bb>6</bb></node><node><aa>7</aa>
<bb>8</bb></node></doc>and afterwards, queries the result set and retrieves the document(s) that has a <aa>7</aa> node:
dbxml> contextQuery "let $s:= . where $s/node[aa=7] return $s"
1 objects returned for expression 'let $s:= . where $s/node[aa=7] return $s'
dbxml> print
<doc><node><aa>1</aa><bb>2</bb></node><node><aa>3</aa><bb>4</bb></node><node><aa>5</aa><bb>6</bb></node><node><aa>7</aa>
<bb>8</bb></node></doc>Now, using the APIs, C++ or Java, you can achieve this functionality by obtaining a result set (either through an XmlQueryExpression.execute() call or an XmlManager.query() call), and than constructing an XmlQueryExpression which will be used while iterating the result set to query against each XmlValue context item (the XmlQueryExpression.execute() forms of the method with an XmlValue &contextItem parameter).
Regards,
Andrei

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