How to set the Match and Return Attributes for Association.cfind() ?

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dcm4che's Association class has a

public DimseRSP cfind(String cuid, int priority, Attributes data, String tsuid, int autoCancel)

method.

Although there is no docs for dcm4che, I assume the data argument of this method is to specify the Attributes of the IOD sent in the C-FIND query.

An Attribute I can define like

Attributes atts = new Attributes();
atts.setString(0x00100010, VR.PN, "*");

and then I call the cfind on my DICOM association like

DimseRSP res = assoc.cfind("1.2.840.10008.5.1.4.31", 0000, atts, "1.2.840.10008.1.2", 0);

to query the MWL of my PACS (dcm4chee) that has many entries.

Then, I receive a null data set from the PACS with no errors.

But I'm not surprised, as how would my PACS know that based on what Attributes I want to query and what Attributes I'm expecting in return? For my purpose, to query all patients on the MWL, I haven't specified enough information in the data argument. But how to do it?

This is what I want in my C-FIND:

<QueryRoot>STUDY</QueryRoot>
<QueryLevel>STUDY</QueryLevel>
<Match>
    <Attribute Tag="00100010">*</Attribute>
</Match>
<Return>
    <Attribute Tag="00100010"/>
</Return>

[Nicolas Roduit]

The library weasis-dicom-tools contains a worklist SCU implementation and an example https://github.com/nroduit/weasis-dicom-tools/blob/master/src/test/java/org/weasis/dicom/ModalityWorklistNetTest.java

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Thanks Nicolas, it helped!