Added Pandas XS node.

docs/reference/node_reference.md

@@ -53,6 +53,7 @@
 | [Pandas Loc Row Series](pandas_loc_row_series.md) | Selects a row from a pandas DataFrame and output as a Series. |
 | [Pandas Select Columns](pandas_select_columns.md) | Selects specific columns from a pandas DataFrame. |
 | [Pandas Select Rows](pandas_select_rows.md) | Selects specific rows from a pandas DataFrame based on a condition. |
+| [Pandas Xs](pandas_xs.md) | Selects a subset of a Pandas DataFrame using specified index labels or positions. |
 ## Data type conversion
 | Node | Description |
 | --- | --- |

docs/reference/pandas_xs.md

@@ -0,0 +1,44 @@
+# Pandas Xs
+Selects a subset of a Pandas DataFrame using specified index labels or positions.
+
+This function extracts a portion of a DataFrame based on MultiIndex labels (row indices or column labels).
+
+Users must specify:
+* The labels to select (comma-separated for multiple labels).
+* The level(s) within the MultiIndex (integer positions).
+* The axis (whether selecting from rows or columns).
+
+**Understanding "Level":**
+In a MultiIndex DataFrame, a level refers to the hierarchical position of an index within the MultiIndex, which can be referenced using a 0-based integer position or an assigned level name.
+Selecting the level using an integer position is similar to integer-based selection in `iloc`.
+
+When specifying a label, Pandas needs to know which level of the MultiIndex to search. 
+For example, if selecting "dog" as a row label and the DataFrame has multiple index levels, 
+you must indicate whether to look in the first index (level 0) or the second index (level 1). 
+
+If selecting multiple labels, their corresponding levels should be provided as a comma-separated list.
+
+Example:
+    Given a DataFrame with a 3-level MultiIndex, the first index is at level 0, the second at level 1, and the third at level 2. Selecting "dog" and "brown" at levels 1 and 2 requires specifying 1, 2 in the Level field of the node. These values are internally converted into a list and passed to Pandas.
+
+The `axis` field specifies whether selection applies to row indices (`axis=0`) or column labels (`axis=1`).
+
+## Input
+| Name | Data type |
+|---|---|
+| dataframe | DataFrame |
+| row_or_column_label | String |
+| label_type |  |
+| level | String |
+| level_type |  |
+| axis |  |
+
+## Output
+| Data type |
+|---|
+| DataFrame |
+
+<HR>
+Category: Data subset selection
+
+ComfyUI Data Analysis Node Reference. © 2025 Hide Inada (HowToSD.com). All rights reserved.