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diff --git a/.venv/lib/python3.12/site-packages/pptx/oxml/chart/plot.py b/.venv/lib/python3.12/site-packages/pptx/oxml/chart/plot.py
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+"""Plot-related oxml objects."""
+
+from __future__ import annotations
+
+from pptx.oxml.chart.datalabel import CT_DLbls
+from pptx.oxml.simpletypes import (
+    ST_BarDir,
+    ST_BubbleScale,
+    ST_GapAmount,
+    ST_Grouping,
+    ST_Overlap,
+)
+from pptx.oxml.xmlchemy import (
+    BaseOxmlElement,
+    OneAndOnlyOne,
+    OptionalAttribute,
+    ZeroOrMore,
+    ZeroOrOne,
+)
+
+
+class BaseChartElement(BaseOxmlElement):
+    """
+    Base class for barChart, lineChart, and other plot elements.
+    """
+
+    @property
+    def cat(self):
+        """
+        Return the `c:cat` element of the first series in this xChart, or
+        |None| if not present.
+        """
+        cats = self.xpath("./c:ser[1]/c:cat")
+        return cats[0] if cats else None
+
+    @property
+    def cat_pt_count(self):
+        """
+        Return the value of the `c:ptCount` descendent of this xChart
+        element. Its parent can be one of three element types. This value
+        represents the true number of (leaf) categories, although they might
+        not all have a corresponding `c:pt` sibling; a category with no label
+        does not get a `c:pt` element. Returns 0 if there is no `c:ptCount`
+        descendent.
+        """
+        cat_ptCounts = self.xpath("./c:ser//c:cat//c:ptCount")
+        if not cat_ptCounts:
+            return 0
+        return cat_ptCounts[0].val
+
+    @property
+    def cat_pts(self):
+        """
+        Return a sequence representing the `c:pt` elements under the `c:cat`
+        element of the first series in this xChart element. A category having
+        no value will have no corresponding `c:pt` element; |None| will
+        appear in that position in such cases. Items appear in `idx` order.
+        Only those in the first ``<c:lvl>`` element are included in the case
+        of multi-level categories.
+        """
+        cat_pts = self.xpath("./c:ser[1]/c:cat//c:lvl[1]/c:pt")
+        if not cat_pts:
+            cat_pts = self.xpath("./c:ser[1]/c:cat//c:pt")
+
+        cat_pt_dict = dict((pt.idx, pt) for pt in cat_pts)
+
+        return [cat_pt_dict.get(idx, None) for idx in range(self.cat_pt_count)]
+
+    @property
+    def grouping_val(self):
+        """
+        Return the value of the ``./c:grouping{val=?}`` attribute, taking
+        defaults into account when items are not present.
+        """
+        grouping = self.grouping
+        if grouping is None:
+            return ST_Grouping.STANDARD
+        val = grouping.val
+        if val is None:
+            return ST_Grouping.STANDARD
+        return val
+
+    def iter_sers(self):
+        """
+        Generate each ``<c:ser>`` child element in this xChart in
+        c:order/@val sequence (not document or c:idx order).
+        """
+
+        def ser_order(ser):
+            return ser.order.val
+
+        return (ser for ser in sorted(self.xpath("./c:ser"), key=ser_order))
+
+    @property
+    def sers(self):
+        """
+        Sequence of ``<c:ser>`` child elements in this xChart in c:order/@val
+        sequence (not document or c:idx order).
+        """
+        return tuple(self.iter_sers())
+
+    def _new_dLbls(self):
+        return CT_DLbls.new_dLbls()
+
+
+class CT_Area3DChart(BaseChartElement):
+    """
+    ``<c:area3DChart>`` element.
+    """
+
+    grouping = ZeroOrOne(
+        "c:grouping",
+        successors=(
+            "c:varyColors",
+            "c:ser",
+            "c:dLbls",
+            "c:dropLines",
+            "c:gapDepth",
+            "c:axId",
+        ),
+    )
+
+
+class CT_AreaChart(BaseChartElement):
+    """
+    ``<c:areaChart>`` element.
+    """
+
+    _tag_seq = (
+        "c:grouping",
+        "c:varyColors",
+        "c:ser",
+        "c:dLbls",
+        "c:dropLines",
+        "c:axId",
+        "c:extLst",
+    )
+    grouping = ZeroOrOne("c:grouping", successors=_tag_seq[1:])
+    varyColors = ZeroOrOne("c:varyColors", successors=_tag_seq[2:])
+    ser = ZeroOrMore("c:ser", successors=_tag_seq[3:])
+    dLbls = ZeroOrOne("c:dLbls", successors=_tag_seq[4:])
+    del _tag_seq
+
+
+class CT_BarChart(BaseChartElement):
+    """
+    ``<c:barChart>`` element.
+    """
+
+    _tag_seq = (
+        "c:barDir",
+        "c:grouping",
+        "c:varyColors",
+        "c:ser",
+        "c:dLbls",
+        "c:gapWidth",
+        "c:overlap",
+        "c:serLines",
+        "c:axId",
+        "c:extLst",
+    )
+    barDir = OneAndOnlyOne("c:barDir")
+    grouping = ZeroOrOne("c:grouping", successors=_tag_seq[2:])
+    varyColors = ZeroOrOne("c:varyColors", successors=_tag_seq[3:])
+    ser = ZeroOrMore("c:ser", successors=_tag_seq[4:])
+    dLbls = ZeroOrOne("c:dLbls", successors=_tag_seq[5:])
+    gapWidth = ZeroOrOne("c:gapWidth", successors=_tag_seq[6:])
+    overlap = ZeroOrOne("c:overlap", successors=_tag_seq[7:])
+    del _tag_seq
+
+    @property
+    def grouping_val(self):
+        """
+        Return the value of the ``./c:grouping{val=?}`` attribute, taking
+        defaults into account when items are not present.
+        """
+        grouping = self.grouping
+        if grouping is None:
+            return ST_Grouping.CLUSTERED
+        val = grouping.val
+        if val is None:
+            return ST_Grouping.CLUSTERED
+        return val
+
+
+class CT_BarDir(BaseOxmlElement):
+    """
+    ``<c:barDir>`` child of a barChart element, specifying the orientation of
+    the bars, 'bar' if they are horizontal and 'col' if they are vertical.
+    """
+
+    val = OptionalAttribute("val", ST_BarDir, default=ST_BarDir.COL)
+
+
+class CT_BubbleChart(BaseChartElement):
+    """
+    ``<c:bubbleChart>`` custom element class
+    """
+
+    _tag_seq = (
+        "c:varyColors",
+        "c:ser",
+        "c:dLbls",
+        "c:axId",
+        "c:bubble3D",
+        "c:bubbleScale",
+        "c:showNegBubbles",
+        "c:sizeRepresents",
+        "c:axId",
+        "c:extLst",
+    )
+    ser = ZeroOrMore("c:ser", successors=_tag_seq[2:])
+    dLbls = ZeroOrOne("c:dLbls", successors=_tag_seq[3:])
+    bubble3D = ZeroOrOne("c:bubble3D", successors=_tag_seq[5:])
+    bubbleScale = ZeroOrOne("c:bubbleScale", successors=_tag_seq[6:])
+    del _tag_seq
+
+
+class CT_BubbleScale(BaseChartElement):
+    """
+    ``<c:bubbleScale>`` custom element class
+    """
+
+    val = OptionalAttribute("val", ST_BubbleScale, default=100)
+
+
+class CT_DoughnutChart(BaseChartElement):
+    """
+    ``<c:doughnutChart>`` element.
+    """
+
+    _tag_seq = (
+        "c:varyColors",
+        "c:ser",
+        "c:dLbls",
+        "c:firstSliceAng",
+        "c:holeSize",
+        "c:extLst",
+    )
+    varyColors = ZeroOrOne("c:varyColors", successors=_tag_seq[1:])
+    ser = ZeroOrMore("c:ser", successors=_tag_seq[2:])
+    dLbls = ZeroOrOne("c:dLbls", successors=_tag_seq[3:])
+    del _tag_seq
+
+
+class CT_GapAmount(BaseOxmlElement):
+    """
+    ``<c:gapWidth>`` child of ``<c:barChart>`` element, also used for other
+    purposes like error bars.
+    """
+
+    val = OptionalAttribute("val", ST_GapAmount, default=150)
+
+
+class CT_Grouping(BaseOxmlElement):
+    """
+    ``<c:grouping>`` child of an xChart element, specifying a value like
+    'clustered' or 'stacked'. Also used for variants with the same tag name
+    like CT_BarGrouping.
+    """
+
+    val = OptionalAttribute("val", ST_Grouping)
+
+
+class CT_LineChart(BaseChartElement):
+    """
+    ``<c:lineChart>`` custom element class
+    """
+
+    _tag_seq = (
+        "c:grouping",
+        "c:varyColors",
+        "c:ser",
+        "c:dLbls",
+        "c:dropLines",
+        "c:hiLowLines",
+        "c:upDownBars",
+        "c:marker",
+        "c:smooth",
+        "c:axId",
+        "c:extLst",
+    )
+    grouping = ZeroOrOne("c:grouping", successors=(_tag_seq[1:]))
+    varyColors = ZeroOrOne("c:varyColors", successors=_tag_seq[2:])
+    ser = ZeroOrMore("c:ser", successors=_tag_seq[3:])
+    dLbls = ZeroOrOne("c:dLbls", successors=(_tag_seq[4:]))
+    del _tag_seq
+
+
+class CT_Overlap(BaseOxmlElement):
+    """
+    ``<c:overlap>`` element specifying bar overlap as an integer percentage
+    of bar width, in range -100 to 100.
+    """
+
+    val = OptionalAttribute("val", ST_Overlap, default=0)
+
+
+class CT_PieChart(BaseChartElement):
+    """
+    ``<c:pieChart>`` custom element class
+    """
+
+    _tag_seq = ("c:varyColors", "c:ser", "c:dLbls", "c:firstSliceAng", "c:extLst")
+    varyColors = ZeroOrOne("c:varyColors", successors=_tag_seq[1:])
+    ser = ZeroOrMore("c:ser", successors=_tag_seq[2:])
+    dLbls = ZeroOrOne("c:dLbls", successors=_tag_seq[3:])
+    del _tag_seq
+
+
+class CT_RadarChart(BaseChartElement):
+    """
+    ``<c:radarChart>`` custom element class
+    """
+
+    _tag_seq = (
+        "c:radarStyle",
+        "c:varyColors",
+        "c:ser",
+        "c:dLbls",
+        "c:axId",
+        "c:extLst",
+    )
+    varyColors = ZeroOrOne("c:varyColors", successors=_tag_seq[2:])
+    ser = ZeroOrMore("c:ser", successors=_tag_seq[3:])
+    dLbls = ZeroOrOne("c:dLbls", successors=(_tag_seq[4:]))
+    del _tag_seq
+
+
+class CT_ScatterChart(BaseChartElement):
+    """
+    ``<c:scatterChart>`` custom element class
+    """
+
+    _tag_seq = (
+        "c:scatterStyle",
+        "c:varyColors",
+        "c:ser",
+        "c:dLbls",
+        "c:axId",
+        "c:extLst",
+    )
+    varyColors = ZeroOrOne("c:varyColors", successors=_tag_seq[2:])
+    ser = ZeroOrMore("c:ser", successors=_tag_seq[3:])
+    del _tag_seq