Updated conformance statement for PatientId changes in STOW

Author: arunmk-ms

articles/healthcare-apis/dicom/dicom-extended-query-tags-overview.md

@@ -79,6 +79,7 @@ The following VR types are supported:
 > [!NOTE]
 > Sequential tags, which are tags under a tag of type Sequence of Items (SQ), are currently not supported.
 > You can add up to 128 extended query tags.
+> We do not index extended query tags if the value is null or empty.
 
 #### Responses
 

articles/healthcare-apis/dicom/dicom-services-conformance-statement-v2.md

@@ -86,7 +86,7 @@ The following DICOM elements are required to be present in every DICOM file atte
 * `PatientID`
 
 > [!NOTE]
-> All UIDs must be between 1 and 64 characters long, and only contain alpha numeric characters or the following special characters: `.`, `-`. `PatientID` is validated based on its `LO` `VR` type.
+> All UIDs must be between 1 and 64 characters long, and only contain alpha numeric characters or the following special characters: `.`, `-`. `PatientID` continues to be a required tag and can have the value as null in the input. `PatientID` is validated based on its `LO` `VR` type.
 
 Each file stored must have a unique combination of `StudyInstanceUID`, `SeriesInstanceUID`, and `SopInstanceUID`. The warning code `45070` is returned if a file with the same identifiers already exists.
 
@@ -462,6 +462,8 @@ We support searching the following attributes and search types.
 | `ManufacturerModelName` | | X | X | X | X |  |
 | `SOPInstanceUID` |  |  | X |  | X | X |
 
+> Note: We do not support searching using empty string for any attributes.
+
 #### Search matching
 
 We support the following matching types.
@@ -893,6 +895,8 @@ We support searching on these attributes:
 |`ProcedureStepState`|
 |`StudyInstanceUID`|
 
+> Note: We do not support searching using empty string for any attributes.
+
 ##### Search Matching
 
 We support these matching types: