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diff --git a/.venv/lib/python3.12/site-packages/pptx/oxml/chart/axis.py b/.venv/lib/python3.12/site-packages/pptx/oxml/chart/axis.py
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+"""Axis-related oxml objects."""
+
+from __future__ import annotations
+
+from pptx.enum.chart import XL_AXIS_CROSSES, XL_TICK_LABEL_POSITION, XL_TICK_MARK
+from pptx.oxml.chart.shared import CT_Title
+from pptx.oxml.simpletypes import ST_AxisUnit, ST_LblOffset, ST_Orientation
+from pptx.oxml.text import CT_TextBody
+from pptx.oxml.xmlchemy import (
+    BaseOxmlElement,
+    OneAndOnlyOne,
+    OptionalAttribute,
+    RequiredAttribute,
+    ZeroOrOne,
+)
+
+
+class BaseAxisElement(BaseOxmlElement):
+    """Base class for catAx, dateAx, valAx, and perhaps other axis elements."""
+
+    @property
+    def defRPr(self):
+        """
+        ``<a:defRPr>`` great-great-grandchild element, added with its
+        ancestors if not present.
+        """
+        txPr = self.get_or_add_txPr()
+        defRPr = txPr.defRPr
+        return defRPr
+
+    @property
+    def orientation(self):
+        """Value of `val` attribute of `c:scaling/c:orientation` grandchild element.
+
+        Defaults to `ST_Orientation.MIN_MAX` if attribute or any ancestors are not
+        present.
+        """
+        orientation = self.scaling.orientation
+        if orientation is None:
+            return ST_Orientation.MIN_MAX
+        return orientation.val
+
+    @orientation.setter
+    def orientation(self, value):
+        """`value` is a member of `ST_Orientation`."""
+        self.scaling._remove_orientation()
+        if value == ST_Orientation.MAX_MIN:
+            self.scaling.get_or_add_orientation().val = value
+
+    def _new_title(self):
+        return CT_Title.new_title()
+
+    def _new_txPr(self):
+        return CT_TextBody.new_txPr()
+
+
+class CT_AxisUnit(BaseOxmlElement):
+    """Used for `c:majorUnit` and `c:minorUnit` elements, and others."""
+
+    val = RequiredAttribute("val", ST_AxisUnit)
+
+
+class CT_CatAx(BaseAxisElement):
+    """`c:catAx` element, defining a category axis."""
+
+    _tag_seq = (
+        "c:axId",
+        "c:scaling",
+        "c:delete",
+        "c:axPos",
+        "c:majorGridlines",
+        "c:minorGridlines",
+        "c:title",
+        "c:numFmt",
+        "c:majorTickMark",
+        "c:minorTickMark",
+        "c:tickLblPos",
+        "c:spPr",
+        "c:txPr",
+        "c:crossAx",
+        "c:crosses",
+        "c:crossesAt",
+        "c:auto",
+        "c:lblAlgn",
+        "c:lblOffset",
+        "c:tickLblSkip",
+        "c:tickMarkSkip",
+        "c:noMultiLvlLbl",
+        "c:extLst",
+    )
+    scaling = OneAndOnlyOne("c:scaling")
+    delete_ = ZeroOrOne("c:delete", successors=_tag_seq[3:])
+    majorGridlines = ZeroOrOne("c:majorGridlines", successors=_tag_seq[5:])
+    minorGridlines = ZeroOrOne("c:minorGridlines", successors=_tag_seq[6:])
+    title = ZeroOrOne("c:title", successors=_tag_seq[7:])
+    numFmt = ZeroOrOne("c:numFmt", successors=_tag_seq[8:])
+    majorTickMark = ZeroOrOne("c:majorTickMark", successors=_tag_seq[9:])
+    minorTickMark = ZeroOrOne("c:minorTickMark", successors=_tag_seq[10:])
+    tickLblPos = ZeroOrOne("c:tickLblPos", successors=_tag_seq[11:])
+    spPr = ZeroOrOne("c:spPr", successors=_tag_seq[12:])
+    txPr = ZeroOrOne("c:txPr", successors=_tag_seq[13:])
+    crosses = ZeroOrOne("c:crosses", successors=_tag_seq[15:])
+    crossesAt = ZeroOrOne("c:crossesAt", successors=_tag_seq[16:])
+    lblOffset = ZeroOrOne("c:lblOffset", successors=_tag_seq[19:])
+    del _tag_seq
+
+
+class CT_ChartLines(BaseOxmlElement):
+    """Used for `c:majorGridlines` and `c:minorGridlines`.
+
+    Specifies gridlines visual properties such as color and width.
+    """
+
+    spPr = ZeroOrOne("c:spPr", successors=())
+
+
+class CT_Crosses(BaseOxmlElement):
+    """`c:crosses` element, specifying where the other axis crosses this one."""
+
+    val = RequiredAttribute("val", XL_AXIS_CROSSES)
+
+
+class CT_DateAx(BaseAxisElement):
+    """`c:dateAx` element, defining a date (category) axis."""
+
+    _tag_seq = (
+        "c:axId",
+        "c:scaling",
+        "c:delete",
+        "c:axPos",
+        "c:majorGridlines",
+        "c:minorGridlines",
+        "c:title",
+        "c:numFmt",
+        "c:majorTickMark",
+        "c:minorTickMark",
+        "c:tickLblPos",
+        "c:spPr",
+        "c:txPr",
+        "c:crossAx",
+        "c:crosses",
+        "c:crossesAt",
+        "c:auto",
+        "c:lblOffset",
+        "c:baseTimeUnit",
+        "c:majorUnit",
+        "c:majorTimeUnit",
+        "c:minorUnit",
+        "c:minorTimeUnit",
+        "c:extLst",
+    )
+    scaling = OneAndOnlyOne("c:scaling")
+    delete_ = ZeroOrOne("c:delete", successors=_tag_seq[3:])
+    majorGridlines = ZeroOrOne("c:majorGridlines", successors=_tag_seq[5:])
+    minorGridlines = ZeroOrOne("c:minorGridlines", successors=_tag_seq[6:])
+    title = ZeroOrOne("c:title", successors=_tag_seq[7:])
+    numFmt = ZeroOrOne("c:numFmt", successors=_tag_seq[8:])
+    majorTickMark = ZeroOrOne("c:majorTickMark", successors=_tag_seq[9:])
+    minorTickMark = ZeroOrOne("c:minorTickMark", successors=_tag_seq[10:])
+    tickLblPos = ZeroOrOne("c:tickLblPos", successors=_tag_seq[11:])
+    spPr = ZeroOrOne("c:spPr", successors=_tag_seq[12:])
+    txPr = ZeroOrOne("c:txPr", successors=_tag_seq[13:])
+    crosses = ZeroOrOne("c:crosses", successors=_tag_seq[15:])
+    crossesAt = ZeroOrOne("c:crossesAt", successors=_tag_seq[16:])
+    lblOffset = ZeroOrOne("c:lblOffset", successors=_tag_seq[18:])
+    del _tag_seq
+
+
+class CT_LblOffset(BaseOxmlElement):
+    """`c:lblOffset` custom element class."""
+
+    val = OptionalAttribute("val", ST_LblOffset, default=100)
+
+
+class CT_Orientation(BaseOxmlElement):
+    """`c:xAx/c:scaling/c:orientation` element, defining category order.
+
+    Used to reverse the order categories appear in on a bar chart so they start at the
+    top rather than the bottom. Because we read top-to-bottom, the default way looks odd
+    to many and perhaps most folks. Also applicable to value and date axes.
+    """
+
+    val = OptionalAttribute("val", ST_Orientation, default=ST_Orientation.MIN_MAX)
+
+
+class CT_Scaling(BaseOxmlElement):
+    """`c:scaling` element.
+
+    Defines axis scale characteristics such as maximum value, log vs. linear, etc.
+    """
+
+    _tag_seq = ("c:logBase", "c:orientation", "c:max", "c:min", "c:extLst")
+    orientation = ZeroOrOne("c:orientation", successors=_tag_seq[2:])
+    max = ZeroOrOne("c:max", successors=_tag_seq[3:])
+    min = ZeroOrOne("c:min", successors=_tag_seq[4:])
+    del _tag_seq
+
+    @property
+    def maximum(self):
+        """
+        The float value of the ``<c:max>`` child element, or |None| if no max
+        element is present.
+        """
+        max = self.max
+        if max is None:
+            return None
+        return max.val
+
+    @maximum.setter
+    def maximum(self, value):
+        """
+        Set the value of the ``<c:max>`` child element to the float *value*,
+        or remove the max element if *value* is |None|.
+        """
+        self._remove_max()
+        if value is None:
+            return
+        self._add_max(val=value)
+
+    @property
+    def minimum(self):
+        """
+        The float value of the ``<c:min>`` child element, or |None| if no min
+        element is present.
+        """
+        min = self.min
+        if min is None:
+            return None
+        return min.val
+
+    @minimum.setter
+    def minimum(self, value):
+        """
+        Set the value of the ``<c:min>`` child element to the float *value*,
+        or remove the min element if *value* is |None|.
+        """
+        self._remove_min()
+        if value is None:
+            return
+        self._add_min(val=value)
+
+
+class CT_TickLblPos(BaseOxmlElement):
+    """`c:tickLblPos` element."""
+
+    val = OptionalAttribute("val", XL_TICK_LABEL_POSITION)
+
+
+class CT_TickMark(BaseOxmlElement):
+    """Used for `c:minorTickMark` and `c:majorTickMark`."""
+
+    val = OptionalAttribute("val", XL_TICK_MARK, default=XL_TICK_MARK.CROSS)
+
+
+class CT_ValAx(BaseAxisElement):
+    """`c:valAx` element, defining a value axis."""
+
+    _tag_seq = (
+        "c:axId",
+        "c:scaling",
+        "c:delete",
+        "c:axPos",
+        "c:majorGridlines",
+        "c:minorGridlines",
+        "c:title",
+        "c:numFmt",
+        "c:majorTickMark",
+        "c:minorTickMark",
+        "c:tickLblPos",
+        "c:spPr",
+        "c:txPr",
+        "c:crossAx",
+        "c:crosses",
+        "c:crossesAt",
+        "c:crossBetween",
+        "c:majorUnit",
+        "c:minorUnit",
+        "c:dispUnits",
+        "c:extLst",
+    )
+    scaling = OneAndOnlyOne("c:scaling")
+    delete_ = ZeroOrOne("c:delete", successors=_tag_seq[3:])
+    majorGridlines = ZeroOrOne("c:majorGridlines", successors=_tag_seq[5:])
+    minorGridlines = ZeroOrOne("c:minorGridlines", successors=_tag_seq[6:])
+    title = ZeroOrOne("c:title", successors=_tag_seq[7:])
+    numFmt = ZeroOrOne("c:numFmt", successors=_tag_seq[8:])
+    majorTickMark = ZeroOrOne("c:majorTickMark", successors=_tag_seq[9:])
+    minorTickMark = ZeroOrOne("c:minorTickMark", successors=_tag_seq[10:])
+    tickLblPos = ZeroOrOne("c:tickLblPos", successors=_tag_seq[11:])
+    spPr = ZeroOrOne("c:spPr", successors=_tag_seq[12:])
+    txPr = ZeroOrOne("c:txPr", successors=_tag_seq[13:])
+    crossAx = ZeroOrOne("c:crossAx", successors=_tag_seq[14:])
+    crosses = ZeroOrOne("c:crosses", successors=_tag_seq[15:])
+    crossesAt = ZeroOrOne("c:crossesAt", successors=_tag_seq[16:])
+    majorUnit = ZeroOrOne("c:majorUnit", successors=_tag_seq[18:])
+    minorUnit = ZeroOrOne("c:minorUnit", successors=_tag_seq[19:])
+    del _tag_seq